Fix unreferenced parameter warning. Patch from STL@microsoft.com

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@274204 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/depr/depr.str.strstreams/depr.strstreambuf/depr.strstreambuf.members/overflow.pass.cpp

@@ -17,7 +17,7 @@
 #include <string>
 #include <strstream>
 
-int main(int, char const **argv) {
+int main() {
   std::ostrstream oss;
   std::string s;