.gitignore update for x86 arch

This patch:
- makes .gitignore files visible to git
- makes arch/x86/kernel/vsyscall_32.lds and arch/i386/boot invisible

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

.gitignore

@@ -26,6 +26,7 @@ vmlinux*
 !vmlinux.lds.S
 System.map
 Module.symvers
+!.gitignore
 
 #
 # Generated include files

arch/i386/.gitignore

+boot

arch/x86/kernel/.gitignore

 vsyscall.lds
+vsyscall_32.lds