tests: Include weston-egl-ext from weston-test

weston-test uses eglBindWaylandDisplayWL and friends, which are defined
either by the EGL implementation, or weston-egl-ext.h as a fallback.
Include weston-egl-ext.h from weston-test, so we can build on systems
whose native EGL implementation doesn't give us the needed defines.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <ppaalanen@gmail.com>

tests/weston-test.c

@@ -33,6 +33,7 @@
 #ifdef ENABLE_EGL
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
+#include "../src/weston-egl-ext.h"
 #endif /* ENABLE_EGL */
 
 struct weston_test {