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/matrix-test.c b/tests/matrix-test.c
index f8f9d95..520e12e 100644
--- a/tests/matrix-test.c
+++ b/tests/matrix-test.c
@@ -32,7 +32,7 @@
 #include <signal.h>
 #include <time.h>
 
-#include "../shared/matrix.h"
+#include "shared/matrix.h"
 
 struct inverse_matrix {
 	double LU[16];		/* column-major */