go.tools/dashboard/app: silence solaris11 and dragonfly builders
go.tools/dashboard/app: silence solaris11 and dragonfly builders

LGTM=aram, minux.ma
R=minux.ma, jsing, ality, aram, 0intro
CC=golang-codereviews
https://golang.org/cl/69980045

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