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sysdeps: Implement _DBUS_DOUBLES_BITWISE_EQUAL with memcmp

Simon McVittie requested to merge smcv/dbus:memcmp into master

memcmp is the Standard C way to compare arbitrary regions of memory bit-by-bit, so let's use it, instead of reinventing it in a way that violates Standard C aliasing rules.

Inspired by part of !192 (merged), in which @rhabacker found various strict-aliasing violations by compiling with a stricter compiler.

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