package/php: fix aarch64 uclibc-ng compile

package/php: fix aarch64 uclibc-ng compile

The aarch64 compile uses the sys/auxv.h header which is not
provided by ulcibc-ng. Add configure.ac patch to check for
the header before using it in ext/standard/crc32.c.

Fixes:

  https://bugs.busybox.net/show_bug.cgi?id=12626

  build/php-7.4.3/ext/standard/crc32.c:26:12: schwerwiegender Fehler: sys/auxv.h: Datei oder Verzeichnis nicht gefunden

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>