Make libtiff link on OS X 10.9

Undefining the 'inline' keyword doesn't look very wise nowadays, and it
did cause duplicate symbol erros at link time when linking against the
10.9 SDK.

Change-Id: Ie6f8639fb920e57289c7d0ad8952603abcfe7377
Reviewed-by: aavit <eirik.aavitsland@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

The inline keyword needs to be defined to __inline
for MSVC when compiling C files.

The patch removing the redefinition of inline does not work
with the updated library, instead we resurrect the ifdef for
MSVC only.

Conflicts:
	src/3rdparty/libtiff/libtiff/tif_config.h

Change-Id: I22bbaf3627fdb4f3dc60c9cd0f8d3282efc5bd2c