go/importer: fix build (disable tests that won't run on builders)
go/importer: fix build (disable tests that won't run on builders)

R=adonovan
TBR=adonovan
CC=golang-dev
https://golang.org/cl/43010043

golang/tools,runcom/tools,magiccao/tools,josharian/tools,runcom/tools,runcom/tools,argandas/tools,josharian/tools,argandas/tools,josharian/tools,magiccao/tools,syreclabs/go-tools,golang/tools,nicot/tools,sshetty10/tools,glasser/golang-tools,nicot/tools,cmars/tools,sshetty10/tools,magiccao/tools,golang/tools,sshetty10/tools,4ad/tools,glasser/golang-tools,springning/tools,nicot/tools,cw2018/tools,golang/tools,jdhenke/tools,glasser/golang-tools,maddyonline/tools,matryer/tools,cmars/tools,4ad/tools,matryer/tools,jdhenke/tools,argandas/tools,syreclabs/go-tools,nicot/tools,cw2018/tools,dmitris/tools,4ad/tools,cmars/tools,dmitris/tools,dmitris/tools,dmitris/tools,syreclabs/go-tools,matryer/tools,josharian/tools,jdhenke/tools,matryer/tools,glasser/golang-tools,maddyonline/tools,maddyonline/tools,cmars/tools,syreclabs/go-tools,springning/tools,sshetty10/tools,maddyonline/tools,springning/tools,syreclabs/go-tools,magiccao/tools,runcom/tools,jdhenke/tools,syreclabs/go-tools,springning/tools,cw2018/tools,argandas/tools,cw2018/tools,golang/tools