Add missing MAX macros, ensure that i3 can be compiled without pango

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
  *

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
 }
 
 /*

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 */