[gtksourceview] build: give testsuite access to gresources

[Christian Hergert <chergert src gnome org>]

commit 7ebe797f5443c7274ada1185841c9005a5669d06
Author: Christian Hergert <chergert redhat com>
Date:   Mon Sep 21 15:23:12 2020 -0700

    build: give testsuite access to gresources
    
    This can get dropped when using the static linking, so we need to ensure
    we compile it in instead.

 testsuite/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/testsuite/meson.build b/testsuite/meson.build
index fdc536ab..08d0a7e5 100644
--- a/testsuite/meson.build
+++ b/testsuite/meson.build
@@ -41,7 +41,7 @@ testsuite_sources = [
 
 foreach test: testsuite_sources
   test_name = test.get(0)
-  test_sources = [
+  test_sources = gtksource_res + [
     '@0@.c'.format(test_name),
   ]