Fix bad regexp

From-SVN: r52994

gcc/testsuite/g++.dg/warn/effc1.C

@@ -10,7 +10,7 @@ class A
 {
   public:
   A & operator+=( int );
-  A & operator+( int ); // { dg-warning "`A& A::operator+(int)' should return by value" "" }
+  A & operator+( int ); // { dg-warning ".* should return by value" "" }
   A operator+=( float );
   A operator+( float );
 };