Adding pango patch (ref. #10)

Text from original patch:

Using pango markup for status text

Use a single font. Removed some code utf8 code from drw.
Created for pango 1.44. Older versions might not have getter
for font height, ascent + descent can be used instead.
All texts are rendered with pango but only status is with
markup. Increased stext size (in case a lot of markup is used).
MIN/MAX is already defined (didn't redefine them).

util.h

@@ -1,7 +1,11 @@
 /* See LICENSE file for copyright and license details. */
 
+#ifndef MAX
 #define MAX(A, B)               ((A) > (B) ? (A) : (B))
+#endif
+#ifndef MIN
 #define MIN(A, B)               ((A) < (B) ? (A) : (B))
+#endif
 #define BETWEEN(X, A, B)        ((A) <= (X) && (X) <= (B))
 
 void die(const char *fmt, ...);