Update arch/x86/boot/.gitignore with new auto-generated files

Signed-off-by: S.Çağlar Onur <caglar@pardus.org.tr>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by S.Çağlar Onur and committed by Linus Torvalds 3b356329 9820380a

+2
+2
arch/x86/boot/.gitignore
··· 3 3 setup 4 4 setup.bin 5 5 setup.elf 6 + cpustr.h 7 + mkcpustr