Restore compiler warnings flags.

Previous work on enabling the build on the latest Mac OS and
Xcode compiler mistakenly took out compiler warning flags.

This restores previously used flags.

Issue noticed by Sovereign Engineer.
Fix 64-bit project generation under Cygwin
Fix VS2012 64-bit debug build
Merge branch 'master' of git://github.com/Lirusaito/SingularityViewer
Merge branch 'master' of https://github.com/lkalif/SingularityViewer
Merge branch 'master' of git://github.com/Lirusaito/SingularityViewer
reverting some changes to llvovolume that seems to break animated textures

Signed-off-by: Siana Gearz <siana.sg@live.de>
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