code review 2294041: runtime: fix build

runtime: fix build

On systems where the mmap succeeds
(e.g., sysctl -w vm.mmap_min_addr=0)
it changes the signal code delivered for a
nil fault from ``page not mapped'' to
``invalid permissions for page.''

[rsc, 2010-09-29 00:49:59]

Hello r (cc: golang-dev@googlegroups.com),

I'd like you to review this change.

[rsc, 2010-09-29 00:50:02]

*** Submitted as http://code.google.com/p/go/source/detail?r=1e0172bf33c8 ***

runtime: fix build

On systems where the mmap succeeds
(e.g., sysctl -w vm.mmap_min_addr=0)
it changes the signal code delivered for a
nil fault from ``page not mapped'' to
``invalid permissions for page.''

TBR=r
CC=golang-dev
http://codereview.appspot.com/2294041

[r2, 2010-09-29 00:55:52]

LGTM