Bug 1373486 - Skip gyp directories when building without a compile environment. r=mshal

security/ is already skipped through top-level moz.build. For
convenience, we skip the DIRS that end up adding GYP_DIRS, avoiding
reindenting their entire moz.build.

--HG--
extra : rebase_source : 346aba5f4ec29112cb2ce035844e57f13a214482

toolkit/toolkit.mozbuild

@@ -46,11 +46,15 @@ DIRS += [
     '/hal',
     '/js/xpconnect',
     '/intl/chardet',
-    '/media/libyuv',
     '/modules/libjar',
     '/storage',
 ]
 
+if CONFIG['COMPILE_ENVIRONMENT']:
+    DIRS += [
+        '/media/libyuv',
+    ]
+
 if CONFIG['MOZ_PERMISSIONS']:
     DIRS += [
         '/extensions/cookie',
@@ -61,7 +65,7 @@ DIRS += [
     '/rdf',
 ]
 
-if CONFIG['MOZ_WEBRTC']:
+if CONFIG['MOZ_WEBRTC'] and CONFIG['COMPILE_ENVIRONMENT']:
     DIRS += [
         '/media/webrtc',
         '/media/mtransport',