build: Use a single bash shell for creating a directory
build: Use a single bash shell for creating a directory

Just a micro-optimization and a consistency fix.

nhlfr/rkt,jakon89/rkt,kbrwn/rkt,Wilybald/rkt,liugenping/rkt,yifan-gu/rocket,joshix/rkt,sstabellini/rkt,monstermunchkin/rkt,Shashwatsh/rkt,jzelinskie/rkt,liugenping/rkt,tmrts/rkt,jasonchaffee/rkt,monstermunchkin/rkt,il9ue/rkt,achanda/rkt,mike1729/rkt,matthaias/rkt,shobhit85/rkt,s-urbaniak/rkt,matthaias/rkt,jonboulle/rkt,kinvolk/rkt,jzelinskie/rkt,jakon89/rkt,coreos/rkt,jjlakis/rkt,cab105/rkt,sinfomicien/rkt,endocode/rkt,nhlfr/rkt,yifan-gu/rkt,sgotti/rkt,jzelinskie/rkt,yifan-gu/rkt,tmrts/rkt,intelsdi-x/rkt,rkt/rkt,lucasallan/rkt,coreos/rkt,mike1729/rkt,linki/rkt,adfernandes/rkt,akshaykarle/rkt,lucasallan/rkt,euank/rkt,achanda/rkt,endocode/rkt,joshix/rkt,rkt/rkt,markllama/rkt,lucasallan/rkt,ybubnov/rkt,tmrts/rkt,s-urbaniak/rkt,adfernandes/rkt,il9ue/rkt,Wilybald/rkt,kbrwn/rkt,endocode/rkt,s-urbaniak/rkt,monstermunchkin/rkt,markllama/rkt,cab105/rkt,dgonyeo/rkt,rkt/rkt,alban/rkt,Shashwatsh/rkt,sinfomicien/rkt,achanda/rkt,kbrwn/rkt,mike1729/rkt,shobhit85/rkt,nhlfr/rkt,lucasallan/rkt,yifan-gu/rocket,kinvolk/rkt,alban/rkt,kinvolk/rkt,krnowak/rkt,ybubnov/rkt,yifan-gu/rkt,sstabellini/rkt,adfernandes/rkt,ybubnov/rkt,Wilybald/rkt,krnowak/rkt,krnowak/rkt,euank/rkt,yifan-gu/rocket,akshaykarle/rkt,linki/rkt,dgonyeo/rkt,liugenping/rkt,squeed/rkt,joshix/rkt,Shashwatsh/rkt,blixtra/rkt,blixtra/rkt,euank/rkt,intelsdi-x/rkt,squeed/rkt,jjlakis/rkt,intelsdi-x/rkt,linki/rkt,Wilybald/rkt,sstabellini/rkt,kinvolk/rkt,rkt/rkt,jasonchaffee/rkt,markllama/rkt,shobhit85/rkt,jasonchaffee/rkt,sgotti/rkt,coreos/rkt,sinfomicien/rkt,jonboulle/rkt,joshix/rkt,sgotti/rkt,jakon89/rkt,akshaykarle/rkt,matthaias/rkt,alban/rkt,blixtra/rkt,dgonyeo/rkt,il9ue/rkt,squeed/rkt,jjlakis/rkt,jonboulle/rkt,cab105/rkt