scons: Move fallback HAVE_* definitions to headers.
These were being defined in SCons, but it's not practical: - we actually need to include Gallium headers from external source trees, with completely disjoint build infrastructure, and it's unsustainable to replicate the HAVE_xxx checks or even hard-coded defines across everywhere. - checking compiler version via command line doesn't really work due to Clang essentially being like a cameleon which can fake either GCC or MSVC There's no change for autoconf. Reviewed-by: Roland Scheidegger <email@example.com> Reviewed-by: Brian Paul <firstname.lastname@example.org>
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