Tests: Avoid running C++11 test on GNU < 4.7

The test added in commit 50e90e2828 (try_compile: Honor CMP0128 setting
in test project, 2022-10-18, v3.25.0-rc2~4^2) requires that the compiler
support C++11 mode, so do not run it on GNU compilers that are too old.

Tests/RunCMake/try_compile/RunCMakeTest.cmake

@@ -121,10 +121,11 @@ run_cmake(Inspect)
 include("${RunCMake_BINARY_DIR}/Inspect-build/info.cmake")
 
 # FIXME: Support more compilers and default standard levels.
-if (CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|AppleClang)$"
-    AND DEFINED CMAKE_CXX_STANDARD_DEFAULT
-    AND DEFINED CMAKE_CXX_EXTENSIONS_DEFAULT
-    )
+if (DEFINED CMAKE_CXX_STANDARD_DEFAULT AND
+    DEFINED CMAKE_CXX_EXTENSIONS_DEFAULT AND (
+    (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 4.7) OR
+    (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+    ))
   run_cmake(CMP0128-WARN)
   if(NOT CMAKE_CXX_STANDARD_DEFAULT EQUAL 11)
     run_cmake(CMP0128-NEW)