build-sys: Add configure check for linux/btrfs.h

btrfs.h was added to uapi in Linux 3.9. To fix building with older
header versions this adds a configure check for the header and re-adds
btrfs definitions to missing.h which was removed in bed2e820 along with
two other ioctls used by gpt-auto-generator.

[ Apparently, btrfs.h was only added recently:
  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=55e301fd57a6239ec14b91a1cf2e70b3dd135194
  let's re-add it for now -- kay ]
getty-generator: Enable getty on all active serial consoles.

This enables a getty on active kernel consoles even when they are not
the last one specified on the kernel command line and mapped to
/dev/console. Now the order "console=ttyS0 console=tty0" works in
addition to "console=tty0 console=ttyS0".