Bug 1596868 - CXXFLAGS, LDFLAGS, etc. regressed by bug 1595906 r=firefox-build-system-reviewers,dmajor

Differential Revision: https://phabricator.services.mozilla.com/D53249

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

python/mozbuild/mozbuild/frontend/context.py

@@ -404,7 +404,7 @@ class LinkFlags(BaseCompileFlags):
              (context.config.substs.get('MOZ_HARDENING_LDFLAGS_JS')
               if _context_under_js_src(context) else
               context.config.substs.get('MOZ_HARDENING_LDFLAGS')),
-             ('LDFLAGS')),
+             ('LDFLAGS',)),
             ('DEFFILE', None, ('LDFLAGS',)),
             ('MOZBUILD', None, ('LDFLAGS',)),
             ('FIX_LINK_PATHS', context.config.substs.get('MOZ_FIX_LINK_PATHS'),