crypto/sha/asm/sha512-ia64.pl: When checking assembler file names, ignore case
crypto/sha/asm/sha512-ia64.pl: When checking assembler file names, ignore case

The use case is that uppercase .ASM extension may be used on some platforms,
and we were only testing for the lowercase extension.

Reviewed-by: Matt Caswell <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@openssl.org>
Reviewed-by: Tomas Mraz <2bc6038c3dfca09b2da23c8b6da8ba884dc2dcc2@openssl.org>
Reviewed-by: Dmitry Belyavskiy <38c64d6e24766247aad56af3a6ddb0056ad36a44@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/19604)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl