Remove redundant header stub file

Author: lcartey

cpp/common/test/includes/standard-library/cstring

@@ -1 +1,29 @@
-#include "cstring.h"
+#ifndef _GHLIBCPP_CSTRING
+#define _GHLIBCPP_CSTRING
+
+#include <string.h>
+
+namespace std {
+using ::memcmp;
+using ::memcpy;
+using ::memmove;
+using ::memset;
+using ::size_t;
+using ::strcat;
+using ::strchr;
+using ::strcmp;
+using ::strcoll;
+using ::strcpy;
+using ::strcspn;
+using ::strlen;
+using ::strncat;
+using ::strncmp;
+using ::strncpy;
+using ::strpbrk;
+using ::strrchr;
+using ::strspn;
+using ::strstr;
+using ::strtok;
+using ::strxfrm;
+} // namespace std
+#endif // _GHLIBCPP_CSTRING