[mutter] cogl: Fix HAVE_COGL_GL guard

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 331e830cf6c0432fbcf9bacf3122b862f07b8bb9
Author: Jonas Ådahl <jadahl gmail com>
Date:   Mon May 21 22:37:18 2018 +0200

    cogl: Fix HAVE_COGL_GL guard
    
    Macro was only defined when defined to 1.

 cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c b/cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c
index a3208a825..dc3c98ba2 100644
--- a/cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c
+++ b/cogl/cogl/driver/gl/gl/cogl-texture-driver-gl.c
@@ -478,7 +478,7 @@ _cogl_texture_driver_size_supported (CoglContext *ctx,
 
   if (gl_target == GL_TEXTURE_2D)
     proxy_target = GL_PROXY_TEXTURE_2D;
-#if HAVE_COGL_GL
+#ifdef HAVE_COGL_GL
   else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
     proxy_target = GL_PROXY_TEXTURE_RECTANGLE_ARB;
 #endif