fix proxygen travis builds

Summary: in the opensource spec I forgot to specify the github org as facebookincubator in D9337956 vs regular facebook, this caused travis builds for proxygen and anything that depends on fizz to fail

Reviewed By: knekritz

Differential Revision: D9482739

fbshipit-source-id: ba5a8f465c81ec1b9f037114ce1da3614a838699

build/fbcode_builder/specs/fizz.py

@@ -12,6 +12,9 @@ def fbcode_builder_spec(builder):
     return {
         'depends_on': [folly, sodium],
         'steps': [
-            builder.fb_github_cmake_install('fizz/fizz/build'),
+            builder.fb_github_cmake_install(
+                'fizz/fizz/build',
+                github_org='facebookincubator',
+            ),
         ],
     }