Fixed key names in the example and test programs.
diff --git a/examples/heightmap.c b/examples/heightmap.c
index 4f8c1c0..f37c732 100644
--- a/examples/heightmap.c
+++ b/examples/heightmap.c
@@ -497,7 +497,7 @@
 {
     switch(key)
     {
-        case GLFW_KEY_ESC:
+        case GLFW_KEY_ESCAPE:
             /* Exit program on Escape */
             running = GL_FALSE;
             break;