Config(8) dependency checking - first patches

[Matt Emmerton]

Folks,

I've written up some patches to add dependency checking to config(8).  This
will help prevent link errors when compiling kernels with an incomplete
kernel config (things like fxp without miibus; umass without da/scbus, etc.)

The current set of patches add support to config(8) to read, parse and use
dependency information; however, no dependency meta-data has been generated
yet.

Notes and patches against 7-CURRENT are at
http://www.gsicomp.on.ca/projects/freebsd/configdep.html.

Comments and suggestions appreciated.

Regards,
--
Matt Emmerton