[gnome-builder] meson: Fix respecting configuration env vars

[Patrick Griffis <pgriffis src gnome org>]

commit 96673411eafc348e26af3a4805bd42fca8ddfaeb
Author: Patrick Griffis <tingping tingping se>
Date:   Tue Dec 20 04:15:58 2016 -0500

    meson: Fix respecting configuration env vars

 plugins/meson/meson_plugin/__init__.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/meson/meson_plugin/__init__.py b/plugins/meson/meson_plugin/__init__.py
index ea7ba04..d9da351 100644
--- a/plugins/meson/meson_plugin/__init__.py
+++ b/plugins/meson/meson_plugin/__init__.py
@@ -291,6 +291,7 @@ class MesonBuildResult(Ide.BuildResult):
             launcher.set_clear_env(False)
         if cwd:
             launcher.set_cwd(cwd.get_path())
+        launcher.overlay_environment(self.config.get_environment())
         return launcher
 
     def _get_ninja(self):