Build fix: Explicitly include stdint.h before cfgparse.tab.h

cfgparse.tab.h uses uint32_t, which is defined in stdint.h.

Should fix the build of 3.ε-bf2 on FreeBSD.

Signed-off-by: Raphael Kubo da Costa <kubito@gmail.com>

src/cfgparse.l

@@ -10,6 +10,7 @@
  */
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h> /* Defines uint32_t, required by cfgparse.tab.h */
 #include "cfgparse.tab.h"
 #include <xcb/xcb.h>