build: allow control over the android arches built
build: allow control over the android arches built

Allow the user to control which of the architectures to build.  If none
is specified, then all of them will be built.

benlangmuir/swift,tkremenek/swift,jckarter/swift,amraboelela/swift,jmgc/swift,JGiola/swift,alblue/swift,amraboelela/swift,CodaFi/swift,devincoughlin/swift,gregomni/swift,benlangmuir/swift,gribozavr/swift,jckarter/swift,aschwaighofer/swift,danielmartin/swift,ahoppen/swift,devincoughlin/swift,shajrawi/swift,karwa/swift,brentdax/swift,gregomni/swift,hooman/swift,parkera/swift,danielmartin/swift,jmgc/swift,lorentey/swift,practicalswift/swift,danielmartin/swift,nathawes/swift,shahmishal/swift,xedin/swift,shajrawi/swift,alblue/swift,stephentyrone/swift,hooman/swift,gregomni/swift,lorentey/swift,xwu/swift,karwa/swift,practicalswift/swift,devincoughlin/swift,shajrawi/swift,alblue/swift,karwa/swift,jckarter/swift,danielmartin/swift,aschwaighofer/swift,ahoppen/swift,xedin/swift,JGiola/swift,airspeedswift/swift,allevato/swift,apple/swift,ahoppen/swift,roambotics/swift,gribozavr/swift,allevato/swift,danielmartin/swift,alblue/swift,airspeedswift/swift,parkera/swift,danielmartin/swift,lorentey/swift,glessard/swift,danielmartin/swift,gribozavr/swift,practicalswift/swift,ahoppen/swift,shahmishal/swift,CodaFi/swift,JGiola/swift,nathawes/swift,roambotics/swift,sschiau/swift,brentdax/swift,shahmishal/swift,stephentyrone/swift,devincoughlin/swift,amraboelela/swift,CodaFi/swift,rudkx/swift,austinzheng/swift,xedin/swift,jmgc/swift,hooman/swift,sschiau/swift,devincoughlin/swift,aschwaighofer/swift,harlanhaskins/swift,brentdax/swift,practicalswift/swift,sschiau/swift,brentdax/swift,roambotics/swift,parkera/swift,nathawes/swift,apple/swift,stephentyrone/swift,gribozavr/swift,practicalswift/swift,shajrawi/swift,brentdax/swift,hooman/swift,airspeedswift/swift,amraboelela/swift,gregomni/swift,jckarter/swift,gribozavr/swift,airspeedswift/swift,JGiola/swift,austinzheng/swift,shahmishal/swift,stephentyrone/swift,shahmishal/swift,lorentey/swift,xedin/swift,gregomni/swift,rudkx/swift,tkremenek/swift,shahmishal/swift,austinzheng/swift,allevato/swift,parkera/swift,atrick/swift,alblue/swift,JGiola/swift,xedin/swift,parkera/swift,devincoughlin/swift,amraboelela/swift,amraboelela/swift,harlanhaskins/swift,CodaFi/swift,rudkx/swift,allevato/swift,harlanhaskins/swift,sschiau/swift,jmgc/swift,austinzheng/swift,ahoppen/swift,glessard/swift,tkremenek/swift,xwu/swift,benlangmuir/swift,ahoppen/swift,shajrawi/swift,glessard/swift,devincoughlin/swift,xwu/swift,xedin/swift,stephentyrone/swift,jmgc/swift,jckarter/swift,allevato/swift,nathawes/swift,aschwaighofer/swift,parkera/swift,practicalswift/swift,shajrawi/swift,lorentey/swift,karwa/swift,hooman/swift,apple/swift,atrick/swift,gribozavr/swift,harlanhaskins/swift,rudkx/swift,nathawes/swift,aschwaighofer/swift,benlangmuir/swift,practicalswift/swift,austinzheng/swift,CodaFi/swift,gribozavr/swift,allevato/swift,parkera/swift,shahmishal/swift,atrick/swift,stephentyrone/swift,roambotics/swift,shahmishal/swift,aschwaighofer/swift,brentdax/swift,austinzheng/swift,airspeedswift/swift,harlanhaskins/swift,sschiau/swift,allevato/swift,benlangmuir/swift,harlanhaskins/swift,karwa/swift,shajrawi/swift,jckarter/swift,glessard/swift,atrick/swift,amraboelela/swift,glessard/swift,austinzheng/swift,CodaFi/swift,karwa/swift,xedin/swift,gribozavr/swift,xwu/swift,hooman/swift,benlangmuir/swift,rudkx/swift,alblue/swift,tkremenek/swift,sschiau/swift,jckarter/swift,shajrawi/swift,lorentey/swift,nathawes/swift,glessard/swift,karwa/swift,CodaFi/swift,xwu/swift,parkera/swift,hooman/swift,roambotics/swift,brentdax/swift,atrick/swift,xwu/swift,nathawes/swift,jmgc/swift,lorentey/swift,tkremenek/swift,airspeedswift/swift,karwa/swift,airspeedswift/swift,apple/swift,practicalswift/swift,gregomni/swift,lorentey/swift,xwu/swift,JGiola/swift,devincoughlin/swift,sschiau/swift,harlanhaskins/swift,roambotics/swift,apple/swift,apple/swift,tkremenek/swift,stephentyrone/swift,tkremenek/swift,jmgc/swift,sschiau/swift,rudkx/swift,aschwaighofer/swift,alblue/swift,xedin/swift,atrick/swift