[build-script] Add a small fixme. NFC.
[build-script] Add a small fixme. NFC.

Rather than having the cmake generator be decided by 3 different options that
can be potentially all set (which makes no sense), this should really just be an
option called cmake_generator that would default to ninja and would have choices
of xcode, eclipse, etc.

hughbe/swift,benlangmuir/swift,arvedviehweger/swift,aschwaighofer/swift,swiftix/swift,jtbandes/swift,karwa/swift,nathawes/swift,practicalswift/swift,practicalswift/swift,swiftix/swift,tardieu/swift,brentdax/swift,kperryua/swift,tkremenek/swift,karwa/swift,danielmartin/swift,CodaFi/swift,jckarter/swift,JGiola/swift,jtbandes/swift,Jnosh/swift,gottesmm/swift,djwbrown/swift,austinzheng/swift,sschiau/swift,modocache/swift,atrick/swift,CodaFi/swift,shajrawi/swift,arvedviehweger/swift,arvedviehweger/swift,JaSpa/swift,harlanhaskins/swift,gregomni/swift,JaSpa/swift,aschwaighofer/swift,ben-ng/swift,hooman/swift,allevato/swift,djwbrown/swift,arvedviehweger/swift,atrick/swift,xedin/swift,benlangmuir/swift,rudkx/swift,jckarter/swift,amraboelela/swift,apple/swift,hughbe/swift,amraboelela/swift,karwa/swift,xedin/swift,tardieu/swift,ahoppen/swift,shahmishal/swift,gottesmm/swift,CodaFi/swift,jtbandes/swift,kperryua/swift,airspeedswift/swift,brentdax/swift,tardieu/swift,aschwaighofer/swift,benlangmuir/swift,felix91gr/swift,shajrawi/swift,ben-ng/swift,kperryua/swift,kstaring/swift,kstaring/swift,jckarter/swift,devincoughlin/swift,austinzheng/swift,manavgabhawala/swift,shahmishal/swift,amraboelela/swift,zisko/swift,amraboelela/swift,ahoppen/swift,JaSpa/swift,natecook1000/swift,devincoughlin/swift,huonw/swift,alblue/swift,shajrawi/swift,IngmarStein/swift,codestergit/swift,harlanhaskins/swift,JGiola/swift,parkera/swift,calebd/swift,atrick/swift,xedin/swift,therealbnut/swift,codestergit/swift,jtbandes/swift,jmgc/swift,return/swift,calebd/swift,tkremenek/swift,austinzheng/swift,tardieu/swift,huonw/swift,devincoughlin/swift,hooman/swift,devincoughlin/swift,gmilos/swift,alblue/swift,devincoughlin/swift,atrick/swift,allevato/swift,JaSpa/swift,sschiau/swift,gmilos/swift,tkremenek/swift,bitjammer/swift,jckarter/swift,zisko/swift,gottesmm/swift,bitjammer/swift,zisko/swift,djwbrown/swift,atrick/swift,lorentey/swift,zisko/swift,practicalswift/swift,tkremenek/swift,therealbnut/swift,Jnosh/swift,stephentyrone/swift,shahmishal/swift,karwa/swift,alblue/swift,gribozavr/swift,OscarSwanros/swift,xwu/swift,allevato/swift,airspeedswift/swift,jmgc/swift,frootloops/swift,uasys/swift,manavgabhawala/swift,jckarter/swift,roambotics/swift,tjw/swift,rudkx/swift,kperryua/swift,roambotics/swift,lorentey/swift,gottesmm/swift,apple/swift,codestergit/swift,apple/swift,IngmarStein/swift,harlanhaskins/swift,apple/swift,lorentey/swift,lorentey/swift,swiftix/swift,glessard/swift,lorentey/swift,frootloops/swift,practicalswift/swift,tinysun212/swift-windows,jmgc/swift,sschiau/swift,brentdax/swift,xwu/swift,gregomni/swift,practicalswift/swift,roambotics/swift,return/swift,ben-ng/swift,kperryua/swift,codestergit/swift,xwu/swift,arvedviehweger/swift,jmgc/swift,alblue/swift,ahoppen/swift,kstaring/swift,aschwaighofer/swift,therealbnut/swift,modocache/swift,lorentey/swift,arvedviehweger/swift,tinysun212/swift-windows,JGiola/swift,tardieu/swift,kstaring/swift,harlanhaskins/swift,stephentyrone/swift,therealbnut/swift,return/swift,xwu/swift,deyton/swift,glessard/swift,calebd/swift,hooman/swift,milseman/swift,danielmartin/swift,xwu/swift,airspeedswift/swift,gmilos/swift,milseman/swift,therealbnut/swift,tinysun212/swift-windows,harlanhaskins/swift,calebd/swift,modocache/swift,tjw/swift,jopamer/swift,shahmishal/swift,austinzheng/swift,hooman/swift,brentdax/swift,milseman/swift,gribozavr/swift,Jnosh/swift,ben-ng/swift,JaSpa/swift,tinysun212/swift-windows,bitjammer/swift,natecook1000/swift,jtbandes/swift,parkera/swift,CodaFi/swift,nathawes/swift,shahmishal/swift,practicalswift/swift,OscarSwanros/swift,felix91gr/swift,gribozavr/swift,gottesmm/swift,manavgabhawala/swift,tjw/swift,codestergit/swift,uasys/swift,hughbe/swift,glessard/swift,CodaFi/swift,gmilos/swift,uasys/swift,practicalswift/swift,hooman/swift,hooman/swift,allevato/swift,JGiola/swift,hughbe/swift,rudkx/swift,lorentey/swift,felix91gr/swift,jckarter/swift,djwbrown/swift,nathawes/swift,modocache/swift,tjw/swift,glessard/swift,jopamer/swift,danielmartin/swift,tkremenek/swift,OscarSwanros/swift,tinysun212/swift-windows,gottesmm/swift,xedin/swift,huonw/swift,ben-ng/swift,swiftix/swift,kstaring/swift,natecook1000/swift,felix91gr/swift,airspeedswift/swift,calebd/swift,IngmarStein/swift,jopamer/swift,xwu/swift,uasys/swift,xedin/swift,jmgc/swift,shahmishal/swift,hughbe/swift,djwbrown/swift,frootloops/swift,jopamer/swift,airspeedswift/swift,jtbandes/swift,jckarter/swift,JGiola/swift,codestergit/swift,djwbrown/swift,danielmartin/swift,gribozavr/swift,jopamer/swift,lorentey/swift,OscarSwanros/swift,brentdax/swift,JaSpa/swift,tjw/swift,airspeedswift/swift,OscarSwanros/swift,gribozavr/swift,harlanhaskins/swift,therealbnut/swift,deyton/swift,parkera/swift,huonw/swift,danielmartin/swift,atrick/swift,airspeedswift/swift,austinzheng/swift,IngmarStein/swift,Jnosh/swift,frootloops/swift,huonw/swift,danielmartin/swift,xedin/swift,rudkx/swift,CodaFi/swift,aschwaighofer/swift,sschiau/swift,aschwaighofer/swift,nathawes/swift,bitjammer/swift,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