Add versioning information to symbols.

Bug: http://b/28178111
Change-Id: I46bf95accd819f4521afb1173d8badcc5e9df31c
diff --git a/libc/include/sys/quota.h b/libc/include/sys/quota.h
index f4f6447..85bb780 100644
--- a/libc/include/sys/quota.h
+++ b/libc/include/sys/quota.h
@@ -40,7 +40,7 @@
 
 __BEGIN_DECLS
 
-int quotactl(int, const char*, int, char*);
+int quotactl(int, const char*, int, char*) __INTRODUCED_IN(25);
 
 __END_DECLS