RFC: consolidate ARM config for BFD

[Simon Richter <Simon dot Richter at hogyros dot de>]

Hi,

this patch attempts to make the ARM configuration more orthogonal. With
this patch, all targets except for arm-netbsd* arm-openbsd* and
arm-*-riscix* are available in big and little endian configurations,
with little endian being the default. Also, "arm", "thumb", "strongarm"
and "xscale" are equivalent, with the exception of arm-*-riscix*. Also,
it asks people using nto*arm* to use arm*-*-nto*.

This is the least intrusive approach. It might probably be more readable
to invent a new variable that looks like $targ, but has a hierarchical
approach to the cpu type, for example using "arm:thumb" instead of just
"thumb".

Comments?

   Simon

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