pgsql: More refactoring, so that the SUBSYS.o rules are now all in one

Log Message:
-----------
More refactoring, so that the SUBSYS.o rules are now all in one place.

Modified Files:
--------------
    pgsql/src/backend/port:
        Makefile (r1.25 -> r1.26)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/Makefile?r1=1.25&r2=1.26)
    pgsql/src/backend/port/darwin:
        Makefile (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/darwin/Makefile?r1=1.5&r2=1.6)
    pgsql/src/backend/port/nextstep:
        Makefile (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/nextstep/Makefile?r1=1.10&r2=1.11)
    pgsql/src/backend/port/win32:
        Makefile (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/port/win32/Makefile?r1=1.11&r2=1.12)
    pgsql/src/timezone:
        Makefile (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/Makefile?r1=1.28&r2=1.29)