runtime: complete windows SysReserve
runtime: complete windows SysReserve

Should fix windows/386 build.

R=brainman
CC=golang-dev
http://codereview.appspot.com/4170041

tv42/old-go,tv42/old-go,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,apparentlymart/golang,ssrl/go,dsriram/golang,dsriram/golang,dsriram/golang,gnanderson/go,ssrl/go,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,ssrl/go,ssrl/go,pombredanne/go-deleteme,pombredanne/go-deleteme,dsriram/golang,ssrl/go,gnanderson/go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,ssrl/go,gnanderson/go,ssrl/go,pombredanne/go-deleteme,tv42/old-go,apparentlymart/golang,tv42/old-go,gnanderson/go,dsriram/golang,gnanderson/go,dsriram/golang,tv42/old-go