modes/asm/ghash-x86_64.pl: refine GNU assembler version detection.
Even though AVX support was added in GAS 2.19 vpclmulqdq was apparently
added in 2.20.
Reviewed-by: NRich Salz <rsalz@openssl.org>
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Even though AVX support was added in GAS 2.19 vpclmulqdq was apparently
added in 2.20.
Reviewed-by: NRich Salz <rsalz@openssl.org>