Support Mac OS X about cpp-dependencies HOT 3 CLOSED

Alternatively you can just use the HAS_MEMRCHR option when configuring with CMake (by using -DHAS_MEMRCHR=OFF parameter) then you have a working cpp-dependencies on OSX already.

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It is an optimization that only helps if you have a fast memrchr. It allows the parser to stop reading when there will be no more includes following, making it skip 90%+ of most source code files. And if your memrchr is SSE optimized that'll skip 16 bytes per few cycles.

But of course, if you have no optimized memrchr it'll be per-character and that won't speed it up much.

I'll cross-integrate the CL that makes the cmakefile have decent defaults per platform instead of a universal one, because on OSX the flag should be off by default.

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Integrated fix for cmakelists to have sensible per-platform defaults.

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