* [libpq] mingw support

* [libpq] Let libpq decides whether to build _shlib or not

libpqcommon.a and libpqport.a are internal libraries intended for
sharing code between the frontend and the backend. It's best to let
the build system decides if the _shlib variant should be built or not

* [libpq] Always run install-lib-static on mingw

* [libpq] Rename .a to .dll.a and move .dll to correct folder

* [libpq] Create bin folder for mingw

* [vcpkg baseline] Update libpq

* [libpq] Link with crypt32 on mingw

* [vcpkg baseline] Update libpq

* [libpq] Fix release/debug only build

* [vcpkg baseline] Update libpq

* [vcpkg] add missing Makefile flag for install step

Signed-off-by: Andrei Lebedev <lebdron@gmail.com>

* [libpq] add custom Makefile to install only required targets

Signed-off-by: Andrei Lebedev <lebdron@gmail.com>