Fix to allow 'compare_versions.m' handle version numbers ending with period

[Muthiah Annamalai]

John W. Eaton wrote:
> On 26-Jan-2009, Muthiah Annamalai wrote:
> | I built this over the weekend, last Saturday. So I must have used the 
> |  checkout from 01/23/09. I forgot the list-address in my reply.
>
> I have no clue why the regexp test is failing for you, and I can't
> reproduce the problem.  So I think you (or someone else who can
> reproduce the problem) will need to do some debugging to determine why
> it is failing.
>
> jwe
>
>   
Looks like I did not have PCRE compiled in, and the configure script 
warns me in the beginning.
-Muthu