Remove F14Memory.h header file from Makefile.am (#874)
Remove F14Memory.h header file from Makefile.am (#874)

Summary:
The headerfile was removed from the source tree, but is still
referenced, causing autotools based builds to fail.
Closes https://github.com/facebook/folly/pull/874

Reviewed By: nbronson

Differential Revision: D8531520

Pulled By: calebmarchent

fbshipit-source-id: 33844e57f4551a66dd13ab9ec03a441c7779c41e

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly