Revert "Move use of __warnattr to __deprecated."

This reverts commit 4645c4f62df49d1ece5aabb7c9fa44ca34d30272.

Change-Id: I6c1062d54a4e2c4f41ce7a403e4e7840e6339146
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 7f1710d..cbd7aeb 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -58,7 +58,7 @@
 extern int clearenv(void);
 
 extern char* mkdtemp(char*);
-extern char* mktemp(char*) __deprecated("mktemp possibly used unsafely; consider using mkstemp");
+extern char* mktemp(char*) __warnattr("mktemp possibly used unsafely; consider using mkstemp");
 
 extern int mkostemp64(char*, int);
 extern int mkostemp(char*, int);