[x11/xdm] fix for environment and configuration files

[Christoph Moench-Tegeder]

## Florent Thoumie (flz at xbsd.org):

> I'm ready to commit this [1] patch. Please test and report.
> [1] http://dump.xbsd.org/freebsd/xdm.diff

Sorry for the late feedback. You lost the trailing slash on the paths
to the config files. The post-patch target should read
	@${REINPLACE_CMD} -e "s|XDMCONFIGDIR/|${PREFIX}/lib/X11/xdm/" \
		-e "s|XDMSCRIPTDIR/|${PREFIX}/lib/X11/xdm/|" \
			${WRKSRC}/config/xdm-config.cpp

I have no test case for the environment problem, but at least I didn't
notice any breakage.
I confirm that xdm now uses the right configuration files.

Regards
Christoph

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