fix: test for arm64 architecture properly in MP3DecoderTests #3124
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on arm64/aarch64 libmpg123 generates bad data leading to the test MP3DecoderTests.test_DecodeMP3As2PiecesMPG123_SameAs1Piece failing. this test was excluded by testing for the
TARGET_CPU_ARM64
macro. but this is an Xcode macro defined inTargetConditionals.h
. thus the test would not be excluded when compiling on a device such as the Raspberry Pi 4 or 5. the portable way to test for arm64 architecture with clang is to check for__aarch64__
: https://stackoverflow.com/a/41666292