Fixes builds with without pango/cairo

https://github.com/i3/i3/pull/2243
https://bugs.gentoo.org/show_bug.cgi?id=576664

--- a/include/libi3.h
+++ b/include/libi3.h
@@ -20,7 +20,7 @@
 #if PANGO_SUPPORT
 #include <pango/pango.h>
 #endif
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
 #include <cairo/cairo-xcb.h>
 #endif
 
@@ -518,7 +518,7 @@ typedef struct placeholder_t {
  */
 char *format_placeholders(char *format, placeholder_t *placeholders, int num);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
 /* We need to flush cairo surfaces twice to avoid an assertion bug. See #1989
  * and https://bugs.freedesktop.org/show_bug.cgi?id=92455. */
 #define CAIRO_SURFACE_FLUSH(surface)  \
@@ -542,7 +542,7 @@ typedef struct surface_t {
     int width;
     int height;
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     /* A cairo surface representing the drawable. */
     cairo_surface_t *surface;
 
--- a/libi3/draw_util.c
+++ b/libi3/draw_util.c
@@ -11,7 +11,7 @@
 #include <string.h>
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
 #include <cairo/cairo-xcb.h>
 #endif
 
@@ -50,7 +50,7 @@ void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_draw
         ELOG("Could not create graphical context. Error code: %d. Please report this bug.\n", error->error_code);
     }
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     surface->surface = cairo_xcb_surface_create(conn, surface->id, surface->visual_type, width, height);
     surface->cr = cairo_create(surface->surface);
 #endif
@@ -62,7 +62,7 @@ void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_draw
  */
 void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
     xcb_free_gc(conn, surface->gc);
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_surface_destroy(surface->surface);
     cairo_destroy(surface->cr);
 
@@ -81,7 +81,7 @@ void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
 void draw_util_surface_set_size(surface_t *surface, int width, int height) {
     surface->width = width;
     surface->height = height;
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_xcb_surface_set_size(surface->surface, width, height);
 #endif
 }
@@ -121,7 +121,7 @@ color_t draw_util_hex_to_color(const char *color) {
 static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_set_source_rgba(surface->cr, color.red, color.green, color.blue, color.alpha);
 #else
     uint32_t colorpixel = color.colorpixel;
@@ -139,7 +139,7 @@ static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surfac
 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     /* Flush any changes before we draw the text as this might use XCB directly. */
     CAIRO_SURFACE_FLUSH(surface->surface);
 #endif
@@ -147,7 +147,7 @@ void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_
     set_font_colors(surface->gc, fg_color, bg_color);
     draw_text(text, surface->id, surface->gc, surface->visual_type, x, y, max_width);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     /* Notify cairo that we (possibly) used another way to draw on the surface. */
     cairo_surface_mark_dirty(surface->surface);
 #endif
@@ -162,7 +162,7 @@ void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_
 void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t color, double x, double y, double w, double h) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_save(surface->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
@@ -194,7 +194,7 @@ void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t col
 void draw_util_clear_surface(xcb_connection_t *conn, surface_t *surface, color_t color) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_save(surface->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
@@ -227,7 +227,7 @@ void draw_util_copy_surface(xcb_connection_t *conn, surface_t *src, surface_t *d
     RETURN_UNLESS_SURFACE_INITIALIZED(src);
     RETURN_UNLESS_SURFACE_INITIALIZED(dest);
 
-#ifdef CAIRO_SUPPORT
+#if CAIRO_SUPPORT
     cairo_save(dest->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
--- a/libi3/font.c
+++ b/libi3/font.c
@@ -397,9 +397,11 @@ static void draw_text_xcb(const xcb_char2b_t *text, size_t text_len, xcb_drawabl
 void draw_text(i3String *text, xcb_drawable_t drawable, xcb_gcontext_t gc,
                xcb_visualtype_t *visual, int x, int y, int max_width) {
     assert(savedFont != NULL);
+#if PANGO_SUPPORT
     if (visual == NULL) {
         visual = root_visual_type;
     }
+#endif
 
     switch (savedFont->type) {
         case FONT_TYPE_NONE:
--- a/src/floating.c
+++ b/src/floating.c
@@ -11,6 +11,10 @@
  */
 #include "all.h"
 
+#ifndef MAX
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#endif
+
 /*
  * Calculates sum of heights and sum of widths of all currently active outputs
  *
--- a/src/util.c
+++ b/src/util.c
@@ -341,10 +341,12 @@ char *pango_escape_markup(char *input) {
     if (!font_is_pango())
         return input;
 
+#if PANGO_SUPPORT
     char *escaped = g_markup_escape_text(input, -1);
     FREE(input);
 
     return escaped;
+#endif
 }
 
 /*
--- a/src/x.c
+++ b/src/x.c
@@ -12,6 +12,10 @@
  */
 #include "all.h"
 
+#ifndef MAX
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#endif
+
 xcb_window_t ewmh_window;
 
 /* Stores the X11 window ID of the currently focused window */