change errno to static linkage (improves PIC code generation)
change errno to static linkage (improves PIC code generation)

rofl0r/musl-old,chneukirchen/musl-chris2,davidlazar/musl,chardi/musl,davidlazar/musl,chneukirchen/musl-chris2,rofl0r/musl-old,chardi/musl,chardi/musl