SSE2/SSSE3 optimized version of get_checksum1() for x86-64

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Requires compilation using GCC C++ front end, build scripts have been
modified accordingly. C++ is only used when the optimization is enabled
(g++ as compiler, x86-64 build target, --enable-sse2 is passed to
configure).

(Wayne made a few tweaks, including making it disabled by default.)

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