Bug 1405345 - ldflags as defined in gypi shouldn't be ignored at least on Solaris for now r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D26287

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

python/mozbuild/mozbuild/frontend/gyp_reader.py

@@ -290,6 +290,8 @@ def process_gyp_result(gyp_result, gyp_dir_attrs, path, config, output,
             context['ASFLAGS'] = target_conf.get('asflags_mozilla', [])
             if use_defines_in_asflags and defines:
                 context['ASFLAGS'] += ['-D' + d for d in defines]
+            if config.substs['OS_TARGET'] == 'SunOS':
+                context['LDFLAGS'] = target_conf.get('ldflags', [])
             flags = target_conf.get('cflags_mozilla', [])
             if flags:
                 suffix_map = {