Merge branch 'ss/compat-bswap-revamp'

Clean-up compat/bswap.h mess. * ss/compat-bswap-revamp: bswap.h: provide a built-in based version of bswap32/64 if possible bswap.h: remove optimized x86 version of bswap32/64 bswap.h: always overwrite ntohl/ ntohll macros bswap.h: define GIT_LITTLE_ENDIAN on msvc as little endian bswap.h: add support for __BYTE_ORDER__