Don't use peg for patch tool.
# Patch janet.h
(def [_ janeth janetconf output] (dyn :args))
-(spit output (peg/replace `#include "janetconf.h"` (slurp janetconf) (slurp janeth)))
+(spit output (string/replace `#include "janetconf.h"` (slurp janetconf) (slurp janeth)))
