re PR bootstrap/46650 (r167010 breaks --enable-build-with-cxx)

	PR bootstrap/46650
	* system.h: Include cstring for cxx bootstrap.

Co-Authored-By: Joseph Myers <joseph@codesourcery.com>

From-SVN: r167764

gcc/ChangeLog

+2010-12-13  Jack Howarth <howarth@bromo.med.uc.edu>
+	    Joseph Myers <joseph@codesourcery.com>
+
+	PR bootstrap/46650
+	* system.h: Include cstring for cxx bootstrap.
+
 2010-12-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR lto/46879

gcc/system.h

@@ -190,6 +190,10 @@ extern int fprintf_unlocked (FILE *, const char *, ...);
 extern int errno;
 #endif
 
+#ifdef __cplusplus
+# include <cstring>
+#endif
+
 /* Some of glibc's string inlines cause warnings.  Plus we'd rather
    rely on (and therefore test) GCC's string builtins.  */
 #define __NO_STRING_INLINES