fbcode_builder: getdeps: libyaml: add manifest
fbcode_builder: getdeps: libyaml: add manifest

Summary: New OpenNSA requires this.

Reviewed By: rsunkad

Differential Revision: D28774940

fbshipit-source-id: c030bbab28546373338608c9324229a07c4bd30c

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro