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

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5752066
diff --git a/.hgignore b/.hgignore
index f306782..b4b9ade 100644
--- a/.hgignore
+++ b/.hgignore
@@ -30,7 +30,6 @@
 misc/goplay/goplay
 misc/osx/*.pkg
 misc/osx/*.dmg
-src/Make.inc
 src/cmd/6a/6a
 src/cmd/?l/enam.c
 src/cmd/cc/y.output
@@ -42,7 +41,6 @@
 src/pkg/exp/norm/maketesttables
 src/pkg/exp/norm/normregtest
 src/pkg/exp/ebnflint/ebnflint
-src/pkg/go/build/syslist.go
 src/pkg/go/doc/headscan
 src/pkg/runtime/goc2c
 src/pkg/runtime/mkversion