go.mobile: update Dockerfile to install hg/git/svn/bzr and freetype and go.tools/go packages.
go.mobile: update Dockerfile to install hg/git/svn/bzr and freetype and go.tools/go packages.

LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/158970044

cainiaocome/mobile,MaxCy330/mobile,samanalysis/mobile,lonphy23t/mobile,0x90sled/mobile,freeman0211/mobile,grategames/mobile,zach-klippenstein/mobile,grategames/mobile,swisspol/mobile,DanielWorld/mobile,steeve/mobile,DanielWorld/mobile,golang/mobile,swisspol/mobile,ichu501/mobile,tempbottle/mobile,b54898533/mobile,xing/gomobile,lonphy23t/mobile,MaxCy330/mobile,swisspol/mobile,steeve/mobile,0x90sled/mobile,MaxCy330/mobile,tempbottle/mobile,ichu501/mobile,ichu501/mobile,ichu501/mobile,swisspol/mobile,tempbottle/mobile,freeman0211/mobile,tempbottle/mobile,goldcaddy77/mobile,qskycolor/mobile,qskycolor/mobile,0x90sled/mobile,ppamorim/mobile,DanielWorld/mobile,cainiaocome/mobile,goldcaddy77/mobile,steeve/mobile,goldcaddy77/mobile,b54898533/mobile,swisspol/mobile,zach-klippenstein/mobile,grategames/mobile,steeve/mobile,freeman0211/mobile,samanalysis/mobile,qskycolor/mobile,ppamorim/mobile,lonphy23t/mobile,goldcaddy77/mobile,0x90sled/mobile,xing/gomobile,cainiaocome/mobile,grategames/mobile,DanielWorld/mobile,cainiaocome/mobile,golang/mobile,lonphy23t/mobile,golang/mobile,zach-klippenstein/mobile,xing/gomobile,samanalysis/mobile,MaxCy330/mobile,ppamorim/mobile,0x90sled/mobile,samanalysis/mobile,zach-klippenstein/mobile,cainiaocome/mobile,b54898533/mobile,goldcaddy77/mobile,qskycolor/mobile,golang/mobile,lonphy23t/mobile,ichu501/mobile,b54898533/mobile,samanalysis/mobile,ppamorim/mobile,xing/gomobile,MaxCy330/mobile,tempbottle/mobile,freeman0211/mobile,b54898533/mobile,ppamorim/mobile,xing/gomobile