pgsql: Use _USE_32BIT_TIME_T when building with MSVC.

Log Message:
-----------
Use _USE_32BIT_TIME_T when building with MSVC. Also, enforce that it's
used when building addons.

Dave Page

Modified Files:
--------------
    pgsql/src/include/port:
        win32.h (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port/win32.h?r1=1.81&r2=1.82)
    pgsql/src/tools/msvc:
        Project.pm (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Project.pm?r1=1.14&r2=1.15)