pgsql-server: Enable thread safety for win32.mak build of PostgreSQL.

Log Message:
-----------
Enable thread safety for win32.mak build of PostgreSQL.

Andreas Pflug

Modified Files:
--------------
    pgsql-server/src/interfaces/libpq:
        fe-connect.c (r1.274 -> r1.275)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/fe-connect.c.diff?r1=1.274&r2=1.275)
        fe-secure.c (r1.41 -> r1.42)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/fe-secure.c.diff?r1=1.41&r2=1.42)
        win32.mak (r1.24 -> r1.25)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/win32.mak.diff?r1=1.24&r2=1.25)

Added Files:
-----------
    pgsql-server/src/interfaces/libpq:
        pthread-win32.c (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/pthread-win32.c?rev=1.1&content-type=text/x-cvsweb-markup)
        pthread.h.win32 (r1.1)

(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/interfaces/libpq/pthread.h.win32?rev=1.1&content-type=text/x-cvsweb-markup)