build: ignore new zfiles, delete temp goplay binary in run.bash

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12320045

.hgignore

@@ -35,10 +35,12 @@ misc/osx/*.dmg
 src/cmd/?a/y.output
 src/cmd/?l/enam.c
 src/cmd/cc/y.output
+src/cmd/cgo/zdefaultcc.go
 src/cmd/dist/dist.dSYM
 src/cmd/gc/mkbuiltin1
 src/cmd/gc/opnames.h
 src/cmd/gc/y.output
+src/cmd/go/zdefaultcc.go
 src/pkg/go/doc/headscan
 src/pkg/runtime/goc2c
 src/pkg/runtime/mkversion

src/run.bash

@@ -161,6 +161,7 @@ time ./run || exit 1
 echo
 echo '#' ../misc/goplay
 go build ../misc/goplay
+rm -f goplay
 
 [ "$GOARCH" == arm ] ||
 (xcd ../test/bench/shootout