.hgignore: delete some dregs

I'd rather delete the file but I doubt that will be popular.

LGTM=adg
R=golang-codereviews, adg
CC=golang-codereviews
https://golang.org/cl/150100043

.hgignore

@@ -23,16 +23,12 @@ _test
 _testmain.go
 build.out
 test.out
-doc/tmpltohtml
 doc/articles/wiki/*.bin
 include/plan9/libc_plan9.h
 misc/cgo/life/run.out
 misc/cgo/stdio/run.out
 misc/cgo/testso/main
 misc/dashboard/builder/builder
-misc/goplay/goplay
-misc/osx/*.pkg
-misc/osx/*.dmg
 src/cmd/?a/y.output
 src/liblink/anames?.c
 src/cmd/cc/y.output
@@ -43,7 +39,6 @@ src/cmd/gc/opnames.h
 src/cmd/gc/y.output
 src/cmd/go/zdefaultcc.go
 src/go/doc/headscan
-src/runtime/goc2c
 src/runtime/mkversion
 src/runtime/z*
 src/unicode/maketables