[PATCH] Install config files

[Alfred M. Szmidt]

   > I find it quite iffy when `make install' in any source tree
   > starts touching anything in SYSCONFDIR...

   If you are running make install without DESTDIR, you doing
   something wrong anyway.

If I am setting up a chroot, copy my configurations files to
DESTDIR/etc/nsswitch.conf, and then do `make install DESTDIR=...' then
I should be able to assume that they have not been overwritten.
`install-sysconf' is a nice compromise in this regard.