graphene

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Hi,

This attempts to fix building with clang-cl (the clang compiler that attempts to be MSVC compatible), by:

• Fixing graphene-macros.h by checking for the existance of __GNUC__ before trying to check its value, since clang-cl defines _MSC_VER but not __GNUC__, unlike clang on *NIX.
• Improve detection of compiler flags used for clang-cl, which follows more the ones used on GCC than Visual Studio, and filter out those that aren't supported. Also, force -msse4.1 since that is required for bulding the SSE 4.1 code on clang-cl.
• Disable the deprecation warnings that result form the Visual Studio headers, which clang-cl utilizes.
• For the SSE/ARM NEON SIMD implementations, make clang-cl follow the GCC codepath, since __extension__ is supported there as well.

With blessings, thank you!