Workaround for GCC 4.8 "deleted ctor in aggregate" bug

include/internal/catch_assertioninfo.h

@@ -21,6 +21,8 @@ namespace Catch {
         StringRef capturedExpression;
         ResultDisposition::Flags resultDisposition;
 
+        // We want to delete this constructor but a compiler bug in 4.8 means
+        // the struct is then treated as non-aggregate
         AssertionInfo() = delete;
     };