runtime/pprof: skip tests that fail on windows-amd64-race builder
runtime/pprof: skip tests that fail on windows-amd64-race builder

R=golang-dev, bradfitz
CC=golang-dev
https://codereview.appspot.com/44180043

tv42/old-go,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,pombredanne/go-deleteme