[gnome-builder] tests: remove in-tree-plugins env var

[Christian Hergert <chergert src gnome org>]

commit 5b8f9718a77bbb8375cb0b64450ccf47ee43badf
Author: Christian Hergert <chergert redhat com>
Date:   Sun May 27 20:26:34 2018 -0700

    tests: remove in-tree-plugins env var
    
    We don't need this anymore since we dynamically link plugins that are used
    in the unit tests (so they're always available as embedded plugins).

 src/tests/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/tests/meson.build b/src/tests/meson.build
index c50fd6505..12adb0e90 100644
--- a/src/tests/meson.build
+++ b/src/tests/meson.build
@@ -12,7 +12,6 @@ typelib_dirs = [
 
 ide_test_env = [
   'GI_TYPELIB_PATH="@0@:$(GI_TYPELIB_PATH)"'.format(':'.join(typelib_dirs)),
-  'GB_IN_TREE_PLUGINS=1',
   'G_TEST_SRCDIR=@0@'.format(meson.current_source_dir()),
   'G_TEST_BUILDDIR=@0@'.format(meson.current_build_dir()),
   'G_DEBUG=gc-friendly',