Remove filtering all warnings

Some time ago a verry effective filter to remove all warnings was introduced
by accident. The problem was a not properly escaped special character in a
regular expression. The commit now fixes the erroneous regex.

CTestCustom.cmake

@@ -75,7 +75,8 @@ set(CTEST_CUSTOM_WARNING_EXCEPTION
 
         # -- warnings from macosx test machines
         "ld: warning: dylib.*was built for newer macOS version.*than being linked"
-        ".*^.*"
+        ".*\\^.*"
+        "warning.*generated."
 
         # -- don't show pragma message warnings
         "Compiling CBM Configuration"