Handle std.h -> std rename.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@15867 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/testsuite/g++.old-deja/g++.brendan/crash39.C

@@ -2,7 +2,7 @@
 // Special g++ Options: -w
 // GROUPS passed old-abort
 //#include <GetOpt.h>
-#include <std.h>
+#include <std>
 #include <stdio.h>
 
 class GetOpt