CMakeDetermineCompilerId: Tolerate stray text around INFO strings

When cross-compiling with Xcode our compiler id test binary may be
compiled with multiple architectures.  The INFO strings should be
identical and therefore de-duplicated.  However, this can be broken by
stray text that happens to sit immediately before or after an INFO
string.  Filter out such text so we can match clean INFO strings.

Fixes: #21526

Modules/CMakeDetermineCompilerId.cmake

@@ -765,6 +765,10 @@ function(CMAKE_DETERMINE_COMPILER_ID_CHECK lang file)
         CMAKE_${lang}_COMPILER_ID_STRINGS "${CMAKE_${lang}_COMPILER_ID_STRINGS}")
     endif()
 
+    # Remove arbitrary text that may appear before or after each INFO string.
+    string(REGEX MATCHALL "INFO:[A-Za-z0-9_]+\\[([^]\"]*)\\]"
+      CMAKE_${lang}_COMPILER_ID_STRINGS "${CMAKE_${lang}_COMPILER_ID_STRINGS}")
+
     # In C# binaries, some strings are found more than once.
     list(REMOVE_DUPLICATES CMAKE_${lang}_COMPILER_ID_STRINGS)