pgsql: Remove references to foreign data wrapper libraries, since they

Log Message:
-----------
Remove references to foreign data wrapper libraries, since they have
been removed. This should unbreak the msvc build again.

Modified Files:
--------------
pgsql/src/tools/msvc:
Mkvcbuild.pm (r1.36 -> r1.37)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Mkvcbuild.pm?r1=1.36&r2=1.37)