arm/compel: add generated headers to .gitignore

[criu]# git status -s
?? compel/arch/arm/plugins/std/syscalls/syscalls.S
?? compel/plugins/include/uapi/std/syscall-aux.S
?? compel/plugins/include/uapi/std/syscall-aux.h
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/.gitignore

 arch/x86/plugins/std/sys-exec-tbl-64.c
 arch/x86/plugins/std/syscalls-64.S
+arch/arm/plugins/std/syscalls/syscalls.S
 include/version.h
 plugins/include/uapi/std/asm/syscall-types.h
 plugins/include/uapi/std/syscall-64.h
 plugins/include/uapi/std/syscall-codes-64.h
 plugins/include/uapi/std/syscall-codes.h
 plugins/include/uapi/std/syscall.h
+plugins/include/uapi/std/syscall-aux.h
+plugins/include/uapi/std/syscall-aux.S