pgsql: Remove libpq.rc, use win32ver.rc for libpq

Remove libpq.rc, use win32ver.rc for libpq

For historical reasons, libpq used a separate libpq.rc file for the
Windows builds while all other components use a common file
win32ver.rc. With a bit of tweaking, the libpq build can also use the
win32ver.rc file. This removes a bit of duplicative code.

Reviewed-by: Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>
Reviewed-by: Michael Paquier <michael(at)paquier(dot)xyz>
Discussion: https://www.postgresql.org/message-id/flat/ad505e61-a923-e114-9f38-9867d161073f(at)2ndquadrant(dot)com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/16a4a3d59cd5574fdc697ea16ef5692ce34c54d5

Modified Files
--------------
src/bin/pgevent/Makefile | 1 -
src/interfaces/libpq/.gitignore | 1 -
src/interfaces/libpq/Makefile | 15 ++++-----------
src/interfaces/libpq/libpq.rc.in | 31 -------------------------------
src/makefiles/Makefile.win32 | 17 +++++++++++------
src/port/win32ver.rc | 10 +++++++---
src/tools/copyright.pl | 1 -
src/tools/msvc/Mkvcbuild.pm | 2 --
src/tools/msvc/Project.pm | 8 ++++++++
src/tools/msvc/Solution.pm | 21 ---------------------
src/tools/msvc/clean.bat | 1 -
src/tools/version_stamp.pl | 7 -------
12 files changed, 30 insertions(+), 85 deletions(-)