websocket: avoid $GOROOT in case it has spaces
websocket: avoid $GOROOT in case it has spaces

Fixes issue 115.

R=r, ukai, sergio
http://codereview.appspot.com/162057

tianon/debian-golang,bdwalton/debian-golang,apparentlymart/golang,pombredanne/go-deleteme,tianon/debian-golang,bdwalton/debian-golang,apparentlymart/golang,tianon/debian-golang,dsriram/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,h8liu/golang,ssrl/go,bdwalton/debian-golang,h8liu/golang,nightlyone/golang,gnanderson/go,ssrl/go,dsriram/golang,gnanderson/go,bdwalton/debian-golang,h8liu/golang,bdwalton/debian-golang,apparentlymart/golang,tianon/debian-golang,tianon/debian-golang,tv42/old-go,ssrl/go,dsriram/golang,apparentlymart/golang,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,nightlyone/golang,nightlyone/golang,bdwalton/debian-golang,nightlyone/golang,gnanderson/go,bdwalton/debian-golang,pombredanne/go-deleteme,gnanderson/go,tianon/debian-golang,tv42/old-go,h8liu/golang,h8liu/golang,nightlyone/golang,ssrl/go,ssrl/go,gnanderson/go,tv42/old-go,h8liu/golang,pombredanne/go-deleteme,ssrl/go,tv42/old-go,tianon/debian-golang,pombredanne/go-deleteme,h8liu/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,bdwalton/debian-golang,tv42/old-go,tianon/debian-golang,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,ssrl/go,nightlyone/golang,nightlyone/golang