Added mkstemp64

Bug: 13076637
Change-Id: I41bf28ab3e6c7325470781e9323eeec023483df5
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 72b554f..9c04059 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -54,6 +54,7 @@
 extern char* mkdtemp(char*);
 extern char* mktemp(char*) __warnattr("mktemp possibly used unsafely; consider using mkstemp");
 extern int mkstemp(char*);
+extern int mkstemp64(char*);
 
 extern long strtol(const char *, char **, int);
 extern long long strtoll(const char *, char **, int);