build: Minor fixes in configure
build: Minor fixes in configure

Removed tabs and modified error messages to stand out a bit more.

rot26/rkt,adfernandes/rkt,dalanlan/rkt,iankronquist/rkt,il9ue/rkt,bsmr-go/rkt,liubq919/rkt,jakon89/rkt,smarvin/rkt,maquanyi/rkt,achanda/rkt,akshaykarle/rkt,monstermunchkin/rkt,sstabellini/rkt,shobhit85/rkt,ChengTiesheng/rkt,blixtra/rkt,krnowak/rkt,markllama/rkt,jonboulle/rkt,bsmr-go/rkt,liugenping/rkt,lucasallan/rkt,luebken/rkt,marineam/rkt,smarvin/rkt,nhlfr/rkt,smarvin/rkt,wparad/rkt,squeed/rkt,alban/rkt,mike1729/rkt,joshix/rkt,ybubnov/rkt,maquanyi/rkt,dgonyeo/rkt,Shashwatsh/rkt,sgotti/rkt,alexhersh/rkt,dgonyeo/rkt,chrisseto/rkt,crawford/rkt,chrisseto/rkt,maquanyi/rkt,alexhersh/rkt,ChengTiesheng/rkt,intelsdi-x/rkt,iankronquist/rkt,dalanlan/rkt,cab105/rkt,kbrwn/rkt,euank/rkt,sgotti/rkt,iaguis/rkt,intfrr/rkt,MattDees/rkt,squeed/rkt,yifan-gu/rkt,shobhit85/rkt,iaguis/rkt,mjg59/rkt,ybubnov/rkt,matthaias/rkt,jjlakis/rkt,lucasallan/rkt,iaguis/rkt,fdserr/rkt,jasonchaffee/rkt,cab105/rkt,il9ue/rkt,liugenping/rkt,rhvgoyal/rkt,kbrwn/rkt,euank/rkt,tv42/rkt,jjlakis/rkt,intelsdi-x/rkt,yifan-gu/rkt,s-urbaniak/rkt,jakon89/rkt,kinvolk/rkt,sgotti/rkt,Yhgenomics/rkt,il9ue/rkt,nhlfr/rkt,adfernandes/rkt,MattDees/rkt,sstabellini/rkt,crawford/rkt,nhlfr/rkt,kinvolk/rkt,liubq919/rkt,bsmr-go/rkt,monstermunchkin/rkt,markllama/rkt,endocode/rkt,markllama/rkt,intfrr/rkt,mjg59/rkt,krnowak/rkt,joshix/rkt,shobhit85/rkt,matthaias/rkt,matthaias/rkt,jasonchaffee/rkt,rkt/rkt,jakon89/rkt,MattDees/rkt,rkt/rkt,jzelinskie/rkt,mjg59/rkt,alban/rkt,dgonyeo/rkt,jasonchaffee/rkt,tmrts/rkt,joshix/rkt,rkt/rkt,Wilybald/rkt,yifan-gu/rkt,adfernandes/rkt,squeed/rkt,linki/rkt,akshaykarle/rkt,fdserr/rkt,coreos/rkt,tmrts/rkt,intfrr/rkt,sinfomicien/rkt,rkt/rkt,euank/rkt,fdserr/rkt,wparad/rkt,yifan-gu/rocket,Yhgenomics/rkt,squaremo/rkt,rhvgoyal/rkt,Yhgenomics/rkt,krnowak/rkt,lee212/rkt,marineam/rkt,jjlakis/rkt,ChengTiesheng/rkt,mike1729/rkt,lucasallan/rkt,s-urbaniak/rkt,crawford/rkt,luebken/rkt,blixtra/rkt,achanda/rkt,tmrts/rkt,Shashwatsh/rkt,linki/rkt,rhvgoyal/rkt,iankronquist/rkt,rot26/rkt,ybubnov/rkt,alexhersh/rkt,akshaykarle/rkt,monstermunchkin/rkt,jonboulle/rkt,blixtra/rkt,jonboulle/rkt,coreos/rkt,s-urbaniak/rkt,tv42/rkt,yifan-gu/rocket,coreos/rkt,joshix/rkt,squaremo/rkt,jzelinskie/rkt,lee212/rkt,luebken/rkt,kbrwn/rkt,kinvolk/rkt,squaremo/rkt,endocode/rkt,rot26/rkt,dalanlan/rkt,marineam/rkt,intelsdi-x/rkt,Wilybald/rkt,kinvolk/rkt,Wilybald/rkt,jzelinskie/rkt,tv42/rkt,lee212/rkt,liugenping/rkt,linki/rkt,sinfomicien/rkt,wparad/rkt,alban/rkt,Shashwatsh/rkt,lucasallan/rkt,chrisseto/rkt,sinfomicien/rkt,Wilybald/rkt,mike1729/rkt,endocode/rkt,cab105/rkt,sstabellini/rkt,liubq919/rkt,yifan-gu/rocket,achanda/rkt