cm_cxx_features: filter out warnings from Xcode 14

```
xcodebuild[13070:54426] [MT] DVTSDK: Warning: SDK path collision for path
```

Source/Checks/cm_cxx_features.cmake

@@ -48,7 +48,7 @@ function(cm_check_cxx_feature name)
     # Filter out libhugetlbfs warnings.
     string(REGEX REPLACE "[^\n]*libhugetlbfs [^\n]*: WARNING[^\n]*" "" check_output "${check_output}")
     # Filter out xcodebuild warnings.
-    string(REGEX REPLACE "[^\n]* xcodebuild\\[[0-9]*:[0-9]*\\] warning: [^\n]*" "" check_output "${check_output}")
+    string(REGEX REPLACE "[^\n]* xcodebuild\\[[0-9]*:[0-9]*\\][^\n]*[Ww]arning: [^\n]*" "" check_output "${check_output}")
     # Filter out icpc warnings
     string(REGEX REPLACE "[^\n]*icpc: command line warning #10121: overriding [^\n]*" "" check_output "${check_output}")
     # Filter out ld warnings.