BLD, SIMD: Fix testing extra checks when -Werror isn't applicable for Clang
#19656
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…or Clang. In certain cases `-Werror` gets skipped during the availability test due to "unused arguments" warnings. To solve the issue, `-Werror-implicit-function-declaration` was added as a secondary flag, which is enough to guarantee the sanity of the testing process when it comes to testing the availability of certain intrinsics.
charris
added
08 - Backport
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Backport of #19642.
In certain cases
-Werrorgets skipped during the availability test dueto "unused arguments" warnings. To solve the issue,
-Werror-implicit-function-declarationwas added as a secondary flag, which is enough to guarantee the sanity of the testing process
when it comes to testing the availability of certain intrinsics.
closes #19624