[NFC] Move the strto*_l stubs closer to use.
[NFC] Move the strto*_l stubs closer to use.

The includes stay at the top, while the stub definitions move closer to
_swift_stdlib_strtoX_clocale_impl.

xwu/swift,allevato/swift,allevato/swift,JGiola/swift,apple/swift,gregomni/swift,nathawes/swift,allevato/swift,hooman/swift,CodaFi/swift,gregomni/swift,hooman/swift,hooman/swift,JGiola/swift,jckarter/swift,CodaFi/swift,gregomni/swift,jckarter/swift,roambotics/swift,atrick/swift,benlangmuir/swift,ahoppen/swift,ahoppen/swift,parkera/swift,parkera/swift,xwu/swift,glessard/swift,jmgc/swift,jmgc/swift,rudkx/swift,JGiola/swift,CodaFi/swift,tkremenek/swift,apple/swift,JGiola/swift,nathawes/swift,gregomni/swift,glessard/swift,xwu/swift,glessard/swift,gregomni/swift,nathawes/swift,xwu/swift,CodaFi/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,glessard/swift,jmgc/swift,rudkx/swift,jckarter/swift,airspeedswift/swift,benlangmuir/swift,tkremenek/swift,JGiola/swift,glessard/swift,allevato/swift,airspeedswift/swift,jckarter/swift,CodaFi/swift,rudkx/swift,parkera/swift,airspeedswift/swift,roambotics/swift,hooman/swift,allevato/swift,tkremenek/swift,jckarter/swift,rudkx/swift,jmgc/swift,atrick/swift,xwu/swift,tkremenek/swift,ahoppen/swift,xwu/swift,nathawes/swift,CodaFi/swift,jckarter/swift,allevato/swift,hooman/swift,parkera/swift,hooman/swift,tkremenek/swift,gregomni/swift,nathawes/swift,atrick/swift,atrick/swift,ahoppen/swift,parkera/swift,JGiola/swift,ahoppen/swift,parkera/swift,jmgc/swift,apple/swift,rudkx/swift,jmgc/swift,nathawes/swift,hooman/swift,xwu/swift,apple/swift,atrick/swift,allevato/swift,apple/swift,rudkx/swift,apple/swift,roambotics/swift,benlangmuir/swift,jckarter/swift,tkremenek/swift,roambotics/swift,roambotics/swift,airspeedswift/swift,CodaFi/swift,roambotics/swift,airspeedswift/swift,jmgc/swift,airspeedswift/swift,parkera/swift,glessard/swift,benlangmuir/swift,benlangmuir/swift,airspeedswift/swift,nathawes/swift,parkera/swift,tkremenek/swift