Fix folly/test/Makefile.am
Fix folly/test/Makefile.am

Summary:
[Folly] Fix `folly/test/Makefile.am`.

Closes #709.

Reviewed By: meyering

Differential Revision: D6282009

fbshipit-source-id: 0f2a992e92d4b94a535f29341920c9f2959819d7

Orvid/folly,facebook/folly,rklabs/folly,rklabs/folly,rklabs/folly,rklabs/folly,facebook/folly,facebook/folly,facebook/folly,Orvid/folly,rklabs/folly,facebook/folly,Orvid/folly,Orvid/folly,Orvid/folly