tests: Remove GLfloat usage.
diff --git a/tests/matrix-test.c b/tests/matrix-test.c
index 8e9d13f..cc78492 100644
--- a/tests/matrix-test.c
+++ b/tests/matrix-test.c
@@ -22,7 +22,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <GLES2/gl2.h>
 #include <math.h>
 #include <unistd.h>
 #include <signal.h>
@@ -54,7 +53,7 @@
 }
 
 static double
-det3x3(const GLfloat *c0, const GLfloat *c1, const GLfloat *c2)
+det3x3(const float *c0, const float *c1, const float *c2)
 {
 	return (double)
 		c0[0] * c1[1] * c2[2] +