Conditionalize insane "#define inline" in libtiff

This was causing mysterious linker errors if building
against the OS X 10.9 SDK.  Limit it to MS compiler,
which does not support 'inline' in C.

Change-Id: Ib1916810d00609b5f8f369f61da83cf739df43c5
Merge topic 'dont-define-inline' into master

b9658e5d Conditionalize insane "#define inline" in libtiff