Fix `rbenv prefix` for `system` version
Fix `rbenv prefix` for `system` version

Should be `/usr` or `/usr/local`, not `/usr/bin` or `/usr/local/bin`

princeofdarkness76/rbenv,yyyc514/rbenv,beck/rbenv,michael-gabenna/rbenv,beck/rbenv,sebhahn/pyenv,drakmail/rbenv,rowhit/pyenv,sodabrew/rbenv,viclim/rbenv,jeongdeoksu/rbenv,pyenv/pyenv,jf/rbenv,shoyan/rbenv,pumpkineater/rbenv,golib/goenv,nobyuki/rbenv,docwhat/rbenv,jeremy/rbenv,lozybean/rbenv,reyesyang/rbenv,jmatbastos/rbenv,sheerun/rbenv,fly19890211/pyenv,leocassarani/rbenv,peterpih/rbenv,michael-gabenna/rbenv,jmatbastos/rbenv,mediadoneright/rbenv,hlecuanda/pyenv,evertrue/rbenv,Angeldude/rbenv,xshwy/pyenv,RinSer/rbenv,BanzaiMan/pyenv,rridhan/rbenv,cehoffman/luaenv,BanzaiMan/pyenv,docwhat/rbenv,howtolearntocode/rbenv,avdhoweb/rbenv,cehoffman/pyenv,jeongdeoksu/rbenv,sebhahn/pyenv,intfrr/rbenv,jmatbastos/rbenv,chenfengyuan/pyenv,OiNutter/nodenv,bradynpoulsen/rbenv,michael-gabenna/rbenv,jmatbastos/rbenv,rowhit/pyenv,sstephenson/rbenv,stivenrgalvis/rbenv,cehoffman/pyenv,rbenv/rbenv,jeongdeoksu/rbenv,yyuu/pyenv,ngyuki/phpenv,nebhale/cfenv,recruit-mtl/pyenv,hauleth/rbenv,cehoffman/luaenv,jmatbastos/rbenv,cyril/rbenv,recruit-mtl/pyenv,sebhahn/pyenv,genome-vendor/pyenv,cdlm/rbenv,syndbg/goenv,ffdc-scm/rbenv-x86_64-linux,jasonkarns/rbenv,howtolearntocode/rbenv,Plaristote/rbenv,zmwangx/pyenv,janusnic/rbenv,yeonsh/pyenv,janusnic/rbenv,cehoffman/rbenv,dnsd/pyenv,intfrr/rbenv,andrew-christianson/rbenv,peterpih/rbenv,princeofdarkness76/rbenv,jasonkarns/rbenv,takluyver/pyenv,adarshmuthappa/nodenv,princeofdarkness76/rbenv,stivenrgalvis/rbenv,syndbg/goenv,almog/rbenv,intfrr/rbenv,blueyed/rbenv,stivenrgalvis/rbenv,bradynpoulsen/rbenv,ffdc-scm/rbenv-x86_64-linux,chenfengyuan/pyenv,genome-vendor/pyenv,brntbeer/rbenv,VShangxiao/pyenv,richo/rbenv,yeonsh/pyenv,SamuraiT/rbenv,bradynpoulsen/rbenv,nodenv/nodenv,pumpkineater/rbenv,lozybean/rbenv,jpfuentes2/st2,hlecuanda/pyenv,royratcliffe/rbenv,reyesyang/rbenv,takluyver/pyenv,habinmusic/pyenv,doitian/rbenv,royratcliffe/rbenv,howtolearntocode/rbenv,dark5un/nodenv,codesdk/rbenv,jasonkarns/rbenv,jeremy/rbenv,andrew-christianson/rbenv,josegonzalez/rbenv,reyesyang/rbenv,asaaki/rsenv,josegonzalez/rbenv,LawnGnome/rbenv,rinrinne/ndkenv,sstephenson/rbenv,sanemat/rbenv,jeremy/rbenv,ffdc-scm/rbenv-x86_64-linux,sstephenson/rbenv,Ferocia/rbenv,cyril/rbenv,cehoffman/nodenv,fly19890211/pyenv,avdhoweb/rbenv,codesdk/rbenv,ffdc-scm/rbenv-x86_64-linux,RinSer/rbenv,obimod/pyenv,VShangxiao/pyenv,beck/rbenv,ox/rbenv,mediadoneright/rbenv,OiNutter/nodenv,yogeshkakde/rbenv,docwhat/rbenv,yyyc514/rbenv,lozybean/pyenv,rbenv/rbenv,peterpih/rbenv,jpfuentes2/st2,viclim/rbenv,talentdeficit/erlenv,viclim/rbenv,pumpkineater/rbenv,habinmusic/pyenv,mediadoneright/rbenv,UCASREN/pyenv,adarshmuthappa/nodenv,yyuu/pyenv,jmatbastos/rbenv,yyuu/rbenv,syndbg/goenv,rridhan/rbenv,pyenv/pyenv,peterhoeg/rbenv,lozybean/rbenv,jrolfs/nodenv,xshwy/pyenv,yogeshkakde/rbenv,pyenv/pyenv,yogeshkakde/rbenv,zmwangx/pyenv,lozybean/pyenv,codesdk/rbenv,rfnash/rbenv,josegonzalez/rbenv,Ferocia/rbenv,cyril/rbenv,avdhoweb/rbenv,jrolfs/nodenv,andrew-christianson/rbenv,ffdc-scm/rbenv-x86_64-linux,SamuraiT/rbenv,dongguangming/pyenv,Angeldude/rbenv,dark5un/nodenv,syndbg/goenv,cehoffman/rbenv,silasb/rbenv,nodenv/nodenv,yyyc514/rbenv,jmatbastos/rbenv,YanhaoYang/rbenv,rridhan/rbenv,RinSer/rbenv,edubkendo/rbenv,SamuraiT/rbenv,cehoffman/nodenv,skalee/rbenv,Ferocia/rbenv,cehoffman/rbenv,obimod/pyenv,janusnic/rbenv,Angeldude/rbenv,dongguangming/pyenv,UCASREN/pyenv,dnsd/pyenv,raa0121/vimenv