include libgen.h for basename(3)

Index: tests/egl/spec/egl_chromium_sync_control/egl_chromium_sync_control.c
--- tests/egl/spec/egl_chromium_sync_control/egl_chromium_sync_control.c.orig
+++ tests/egl/spec/egl_chromium_sync_control/egl_chromium_sync_control.c
@@ -35,6 +35,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <time.h>
+#include <libgen.h>
 
 #include "piglit-util-egl.h"
 #include "piglit-util-gl.h"
