CheckCompilerFlags: Revert "Catch linker warning about ignored flags"

Revert commit f745e0497e (CheckCompilerFlags: Catch linker warning about
ignored flags, 2022-01-03, v3.23.0-rc1~174^2).  It regressed cases where
incidental linker warnings were previously tolerated.  Revert the change
pending further investigation.

Fixes: #23432
Issue: #22961

Modules/CMakeCheckCompilerFlagCommonPatterns.cmake

@@ -13,7 +13,6 @@ macro (CHECK_COMPILER_FLAG_COMMON_PATTERNS _VAR)
     FAIL_REGEX "unknown .*option"                          # Clang
     FAIL_REGEX "optimization flag .* not supported"        # Clang
     FAIL_REGEX "unknown argument ignored"                  # Clang (cl)
-    FAIL_REGEX "warning: .* ignored"                       # Clang (linker)
     FAIL_REGEX "ignoring unknown option"                   # MSVC, Intel
     FAIL_REGEX "warning D9002"                             # MSVC, any lang
     FAIL_REGEX "option.*not supported"                     # Intel