FreeImage for LuxRender

This is FreeImage 3.17.0 clone to be used when building LuxRender (on OS X)

• It has general fixes so that it can be compiled with C++11 and -Wc++11-narrowing
• It has altered Makefile.osx
  • Builds only 64 bit
  • Specify MACOSX_DEPLOYMENT_TARGET
  • For 10.7+ and C++11 keep -std=c++11 -stdlib=libc++ -Wc++11-narrowing in COMPILERPPFLAGS
  • For 10.7+ and no C++11 remove -std=c++11 -stdlib=libc++ -Wc++11-narrowing in COMPILERPPFLAGS
  • For 10.6 remove -std=c++11 -stdlib=libc++ -Wc++11-narrowing and add -stdlib=libstdc++ in COMPILERPPFLAGS