qlzcompress is not available everywhere, and there's no support for it i...

Summary: ...n OSS
Closes https://github.com/facebook/hhvm/pull/4236

Reviewed By: @JoelMarcey

Differential Revision: D1677289

Signature: t1:1677289:1415838727:13f5c39992451100d1131869f931f6c1ccb2128b