Fixes implicit declaration errors on some system, additionally
these defines are required according to the manpages.
Index: src/splashy_config-functions.c
===================================================================
--- src/splashy_config-functions.c	(revision 931)
+++ src/splashy_config-functions.c	(working copy)
@@ -25,6 +25,7 @@
  * Boston, MA 02110-1301 USA 
  */
 
+#define _GNU_SOURCE
 #include <stdlib.h>             /* system, exit */
 #include <string.h>             /* strlen */
 #include <unistd.h>             /* getuid */
Index: src/splashy_pgrep.c
===================================================================
--- src/splashy_pgrep.c	(revision 931)
+++ src/splashy_pgrep.c	(working copy)
@@ -13,6 +13,8 @@
  */
 
 
+#define _XOPEN_SOURCE
+#define _XOPEN_SOURCE_EXTENDED
 #include <stdio.h>
 #include <stdlib.h>
 #include <limits.h>