Patch to add version numbers to libpq.rc

Bruce Momjian wrote:
> We could do "date '+%y%j' to output 04349. How many bits do we have for
> that last comma value? This would work unless you put out two
> installers in the same day. However, this would not work for VC and BCC
> because they don't have 'date'. This would give us an ever-increasing
> value for each release.

Here is a sample patch for automatically adding the year/julian date to
the libpq.rc file. It requires moving libpq.rc to libpq.rc.in and then
making the Makefile modifications attached. I also included how
libpq.rc changes so you can see the numbers added.

I have used the existing *.def build method but for a final version I
think I have to make it its own rule so it is recreated on every MinGW
build rather than just when exports.txt changes or a package prepdist
build is made. VC and BCC aleady require a prepdist build so we should
be OK with having this built at that time always. I can see pginstaller
building from CVS and would like to make sure it has an updated day
stamp so I am thinking it should be recreated every time libpqrc.o is
created.

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