Proposed patch for '-version-number' option for libtool

[Keith Packard]

To permit automake and libtool to replace imake and other legacy build 
environments, explicit version numbering of libraries is required.  This
patch adds a '-version-number' option to libtool which computes approprate 
current, age and revision values for each supported build environment so 
that the resulting library version numbers match those provided.  This
round-about mechachanism was selected mostly to ensure .la file 
compatibility.   An additional benefit is that the changes are small and 
localized; future changes to the system will probably not require any 
maintenence of this feature.

I also found a problem in the configuration scripts when building libtool 
with autoconf 2.57 and automake 1.4-p6; a fix for that is enclosed at
the bottom of this patch.

-keith

version-number.patch
Description: version-number.patch