kvm-userland: Update .gitignore

Index: b/.gitignore
===================================================================
@@ -33,3 +33,27 @@ bios/*.txt
 bios/acpi-dsdt.aml
 vgabios/*.bin
 vgabios/*.txt
+extboot/extboot.bin
+extboot/extboot.img
+extboot/signrom
+kernel/Module.markers
+kernel/i825[49].[ch]
+kernel/include-compat/asm
+kernel/include-compat/asm-x86/asm-x86
+kernel/include
+kernel/ioapic.[ch]
+kernel/iodev.h
+kernel/irq.[ch]
+kernel/kvm_trace.c
+kernel/lapic.[ch]
+kernel/mmu.h
+kernel/modules.order
+kernel/tss.h
+kernel/x86.c
+qemu/pc-bios/extboot.bin
+qemu/qemu-doc.html
+qemu/*.1
+qemu/*.pod
+qemu/qemu-tech.html
+user/kvmtrace
+user/test/x86/bootstrap