Patch: RFC: bump libtool version

[Matthias Klose]

Tom Tromey schrieb:
> Matthias pointed out on irc that we ought to bump the libgcj version
> on trunk.  I think we also need this on the RH 4.1 merge branch.
> 
> I thought I would see if there are any comments before I check this in.

one more thing; currently we do not change the versioned gcj subdir when
we change the libgcj soversion. At least for distributions like debian
and ubuntu that means that we do have file conflicts if we bump the
libgcj soversion and keep the gcc version (having packages like libgcj7
and libgcj8). Would it make sense to have the gcj subdir be versioned
with the libgcj soversion instead of the gcc version? I'll propose such
a patch once we can agree on such a change.

  Matthias