cxx.cc: Disable C++14 warning for new sized delete operator

As long as we're not building in C++14 mode, the definition of the
sized delete operator results in a compatibility warning.

	* cxx.cc (operator delete): Disable C++14 warning for sized	variant.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/cxx.cc

@@ -29,11 +29,15 @@ operator delete (void *p)
 {
   free (p);
 }
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wc++14-compat"
 void
 operator delete (void *p, size_t)
 {
   ::operator delete(p);
 }
+#pragma GCC diagnostic pop
 
 void *
 operator new[] (std::size_t s)