pginstaller - pginst: Remove support for non-stackbuilder builds.

Log Message:
-----------
Remove support for non-stackbuilder builds.

Modified Files:
--------------
    pginst:
        README (r1.22 -> r1.23)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/README.diff?r1=1.22&r2=1.23)
        paths.projinc.in (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/paths.projinc.in.diff?r1=1.5&r2=1.6)
        pginst.proj (r1.14 -> r1.15)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/pginst.proj.diff?r1=1.14&r2=1.15)
        settings.projinc (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/settings.projinc.diff?r1=1.15&r2=1.16)
    pginst/wxs:
        dialogs.wxs (r1.68 -> r1.69)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/dialogs.wxs.diff?r1=1.68&r2=1.69)
        pginst.wxs (r1.226 -> r1.227)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pginstaller/pginst/wxs/pginst.wxs.diff?r1=1.226&r2=1.227)