misc/cgo/testcdefs: rm correct file in test.bash

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/39780043

misc/cgo/testcdefs/test.bash

@@ -12,5 +12,5 @@ done
 
 go build . && ./testcdefs
 EXIT=$?
-rm -rf _obj main *.h
+rm -rf _obj testcdefs *.h
 exit $EXIT