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In 1af265f0 (compat/bswap.h: simplify MSVC endianness detection, 2020-11-08) we attempted to simplify code by assuming MSVC builds will be for little-endian machines, since only unusably old versions of MSVC supported big-endian MIPS and m68k architectures. However, it's possible that MSVC could be ported to build for a big-endian architecture again, so the simplification wasn't as future-proof as hoped. So let's go back to the old way of detecting MSVC, and then checking architecture from a list of little-endian architecture macros. Note that MSVC does not treat ARM64 as bi-endian, so we can safely treat it as little-endian. Helped-by: brian m. carlson <sandals@crustytoothpaste.net> Helped-by: Jeff King <peff@peff.net> Helped-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Daniel Gurney <dgurney99@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>