Remove redundant #include path component.

Using the parent '../' path component in #include statements makes
the codebase more rigid and is redundant due to proper -I use.

Signed-off-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/tests/vertex-clip-test.c b/tests/vertex-clip-test.c
index 347dc33..2a5ec10 100644
--- a/tests/vertex-clip-test.c
+++ b/tests/vertex-clip-test.c
@@ -30,7 +30,7 @@
 
 #include "weston-test-runner.h"
 
-#include "../src/vertex-clipping.h"
+#include "src/vertex-clipping.h"
 
 #define BOUNDING_BOX_TOP_Y 100.0f
 #define BOUNDING_BOX_LEFT_X 50.0f