GNUSTEP_LOCAL_ROOT separated from GNUSTEP_SYSTEM_ROOT

[Nicola Pero]

Matthias Klose asked me if it would be possible to allow the
GNUSTEP_LOCAL_ROOT to be completely separated from the
GNUSTEP_SYSTEM_ROOT, ie in Debian they want to do something like - 

GNUSTEP_SYSTEM_ROOT = /usr/lib/GNUstep/System/
GNUSTEP_LOCAL_ROOT  = /usr/local/lib/GNUstep/Local/

Because it seems their filesystem policies do not like having the
Local root under /usr/ - they want it under /usr/local/.

Any points against this change ? 

Any complicated stuff to do to make it work you are aware of ?

A different GNUSTEP_LOCAL_ROOT would be triggered by using an option
to configure gnustep-make.  The weird GNUSTEP_LOCAL_ROOT would be
somewhat saved into your GNUstep.sh.

Would this change break something in the bundle code ?