Revert "Use .s extension for ia64 assembler"

This reverts commit 6009997abd2594d5a7c0606176f404190922b74d.

The .s extension is incorrect as the assembler files contain
preproces

Revert "Use .s extension for ia64 assembler"

This reverts commit 6009997abd2594d5a7c0606176f404190922b74d.

The .s extension is incorrect as the assembler files contain
preprocessor directives.

Fixes #18259

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18263)

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