[Ohrrpgce] SVN: james/8512 fix compile problem on Mac. errno.h needed to be included in filelayer.c

[subversion at HamsterRepublic.com]

james
2017-03-08 10:29:20 -0800 (Wed, 08 Mar 2017)
132
fix compile problem on Mac. errno.h needed to be included in filelayer.cpp , I think it was already correctly included in os_unix.c
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U   wip/filelayer.cpp
U   wip/os_unix.c