Bug 1520139: Make sure nsXREDirProvider can find commonupdatedir.h regardless of whether the updater is enabled. r=froydnj

When the updater is disabled toolkit/mozapps/update/common is not traversed as
part of the build. But toolkit/mozapps/update/common/commonupdatedir.cpp is
included in the toolkit/xre build regardless and GetInstallHash is used. This
makes nsXREDirProvider.cpp able to find the header that defines it.

Differential Revision: https://phabricator.services.mozilla.com/D16582

--HG--
extra : moz-landing-system : lando

toolkit/xre/moz.build

@@ -190,6 +190,7 @@ LOCAL_INCLUDES += [
     '../components/find',
     '../components/printingui/ipc',
     '../components/windowwatcher',
+    '../mozapps/update/common',
     '../profile',
     '/config',
     '/dom/base',