[gdk-pixbuf/macos-ci] Skip resource tests with glib subproject

[Matthias Clasen <matthiasc src gnome org>]

commit 64ee4abcb81ed0f47cae2befb17dc868e4244310
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 3 16:44:36 2021 -0500

    Skip resource tests with glib subproject
    
    It doesn't work.

 tests/meson.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index ab7ff1eee..464f8c4c9 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,9 +1,12 @@
 # Resources contain PNG and BMP files, so we need these two loaders
 # enabled in order to build them
-if enabled_loaders.contains('png')
+if glib_dep.type_name != 'internal' and enabled_loaders.contains('png')
   # Resources; we cannot use gnome.compile_resources() here, because we need to
   # override the environment in order to use the utilities we just built instead
   # of the system ones
+  # On the other hand, the gen_resources script does not work if
+  # we use glib as a subproject, since it won't find glib-compile-resources
+  # in the path
   resources_c = custom_target('resources.c',
     input: 'resources.gresource.xml',
     output: 'resources.c',