Autotools: fix configure check for aarch64 CRC32 API #15587
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On arm 32 bit the check succeeds leading to a build error later on:
/home/autobuild/autobuild/instance-3/output-1/build/php-8.3.10/ext/standard/crc32.c:70:12:
error: 'armv8-a' does not support feature 'nothing'
70 | # pragma GCC target ("+nothing+crc")