Fix make release for 4-STABLE

[Colin Percival]

At 09:28 19/01/2004, Ruslan Ermilov wrote:
>Maybe it's time for drivers.flp to appear on RELENG_4?  If someone
>could MFC the support to sysinstall, I could help with release/
>bits.

   I've already mentioned this to re@, but if there's a real need
for space-saving, using NetBSD's makefs (ports/sysutils/makefs)
saves about 23k on the mfsroot floppy.

Colin Percival