multi-arched alpha won't build with OSF1 4.0d's cc

[Alexandre Oliva]

OSF1 4.0d's cc complains when a non-constant value is used as the
array size of a formal parameter.  The first patch below fixes the
problem without removing the documentation value of the array size at
that point.  I wonder if just commenting out the (variable) array size
would be a better choice.

It also rightfully refuses to compile functions containing automatic
arrays of non-constant sizes.  The second patch below fixes this
problem.

With these two patches, GDB mainline builds on this platform again,
using this picky/dumb compiler.

Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer