.hgignore: delete references to Make.inc and syslist.go
.hgignore: delete references to Make.inc and syslist.go

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/5752066
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go