[android] Fix test setup for Android to avoid using -sdk.
[android] Fix test setup for Android to avoid using -sdk.

The recently introduced changes to make the -sdk also the resource
directory broke the tests in Android, since -sdk was being used because
it is passed as --sysroot to child invocations, which was convinient.

This commit removes those usages in the test suite, and switches to use
--sysroot for the compiler and the linker. Even if in Android only the
linker bit is necessary (since the NDK headers are somewhere different,
and are passed as -I parameters to Swift).

gregomni/swift,devincoughlin/swift,CodaFi/swift,tkremenek/swift,CodaFi/swift,jckarter/swift,parkera/swift,jmgc/swift,lorentey/swift,rudkx/swift,airspeedswift/swift,gribozavr/swift,lorentey/swift,ahoppen/swift,karwa/swift,ahoppen/swift,roambotics/swift,devincoughlin/swift,shahmishal/swift,atrick/swift,stephentyrone/swift,JGiola/swift,karwa/swift,jmgc/swift,karwa/swift,allevato/swift,jckarter/swift,lorentey/swift,gregomni/swift,benlangmuir/swift,gribozavr/swift,benlangmuir/swift,lorentey/swift,rudkx/swift,CodaFi/swift,shahmishal/swift,roambotics/swift,xwu/swift,stephentyrone/swift,CodaFi/swift,aschwaighofer/swift,nathawes/swift,apple/swift,atrick/swift,sschiau/swift,devincoughlin/swift,tkremenek/swift,JGiola/swift,gribozavr/swift,devincoughlin/swift,tkremenek/swift,harlanhaskins/swift,jmgc/swift,stephentyrone/swift,gribozavr/swift,parkera/swift,devincoughlin/swift,ahoppen/swift,shahmishal/swift,shahmishal/swift,jckarter/swift,aschwaighofer/swift,JGiola/swift,benlangmuir/swift,stephentyrone/swift,jmgc/swift,sschiau/swift,parkera/swift,tkremenek/swift,nathawes/swift,airspeedswift/swift,rudkx/swift,devincoughlin/swift,sschiau/swift,tkremenek/swift,jckarter/swift,jmgc/swift,allevato/swift,lorentey/swift,glessard/swift,JGiola/swift,harlanhaskins/swift,benlangmuir/swift,sschiau/swift,roambotics/swift,parkera/swift,apple/swift,airspeedswift/swift,nathawes/swift,karwa/swift,sschiau/swift,hooman/swift,jmgc/swift,xwu/swift,atrick/swift,atrick/swift,shahmishal/swift,devincoughlin/swift,apple/swift,allevato/swift,jckarter/swift,apple/swift,airspeedswift/swift,parkera/swift,gribozavr/swift,lorentey/swift,allevato/swift,harlanhaskins/swift,roambotics/swift,allevato/swift,allevato/swift,CodaFi/swift,sschiau/swift,harlanhaskins/swift,karwa/swift,hooman/swift,aschwaighofer/swift,aschwaighofer/swift,benlangmuir/swift,harlanhaskins/swift,ahoppen/swift,airspeedswift/swift,hooman/swift,apple/swift,nathawes/swift,gregomni/swift,benlangmuir/swift,jckarter/swift,hooman/swift,karwa/swift,glessard/swift,xwu/swift,ahoppen/swift,roambotics/swift,shahmishal/swift,JGiola/swift,lorentey/swift,glessard/swift,hooman/swift,gribozavr/swift,nathawes/swift,gregomni/swift,allevato/swift,harlanhaskins/swift,glessard/swift,JGiola/swift,lorentey/swift,aschwaighofer/swift,apple/swift,nathawes/swift,karwa/swift,airspeedswift/swift,karwa/swift,nathawes/swift,sschiau/swift,stephentyrone/swift,stephentyrone/swift,gribozavr/swift,rudkx/swift,xwu/swift,hooman/swift,gregomni/swift,CodaFi/swift,glessard/swift,xwu/swift,parkera/swift,airspeedswift/swift,sschiau/swift,tkremenek/swift,gribozavr/swift,shahmishal/swift,devincoughlin/swift,rudkx/swift,aschwaighofer/swift,stephentyrone/swift,harlanhaskins/swift,tkremenek/swift,roambotics/swift,jmgc/swift,atrick/swift,rudkx/swift,xwu/swift,xwu/swift,parkera/swift,jckarter/swift,aschwaighofer/swift,glessard/swift,parkera/swift,atrick/swift,shahmishal/swift,hooman/swift,gregomni/swift,CodaFi/swift,ahoppen/swift