bare bsps configurations to test

[joel at oarcorp.com (joel at oarcorp.com)]

Both Ralf and David have found problems recently for configurations I do
not build because there are not BSPs in the tree which trip the code.
I have some hooks in my test script now to recognize some special bare
bsps.  I have only used them to test the bare bsp configuration stuff and
do not regularly build them. 

What I am considering is adding more configurations to my full build set.
I hope these would be bare BSP configurations which do not correspond to
any of the BSPs.  For example, I do not think there is a point in building
a bare cpu32 since the gen68360 supports everything enabled.  On the other
hand, there are a lot of CPU families and models for which the networking
code is not compiled.

Suggestions appreciated for a list of CPU models/cflags which need to be
test-compiled as bare bsps.  It may end up that the best thing is simply
for me to define bare bsp configurations for every CPU model and take the
hit on the build time.   

Once the BSPs are split out from the main source tree and all non-BSP
specific code is multilib'ed, I do not think we will have this problem any
more.

Comments and suggestions appreciated.

--joel