Suppress parentheses warnings on clang and gcc

- should address #593, #528, #521, #496 (and possibly others)

include/internal/catch_capture.hpp

@@ -33,6 +33,7 @@
     do { \
         Catch::ResultBuilder __catchResult( macroName, CATCH_INTERNAL_LINEINFO, #expr, resultDisposition ); \
         try { \
+            CATCH_INTERNAL_SUPPRESS_PARENTHESES_WARNINGS \
             ( __catchResult <= expr ).endExpression(); \
         } \
         catch( ... ) { \