deskutils/xdg-desktop-portal: disable (broken) support for flatpak and snaps

Make it possible to run firefox with KDE filedialogs.

The call for parse_app_info_from_flatpak_info uses the /proc/$PID/root
file to access the flatpak information file.

We neither have support for /proc/$PID/root nor flatpaks or snaps.

With this fix and deskutils/plasma5-xdg-desktop-portal-kde it is now possible
to run firefox using the KDE file dialogs.

> GTK_USE_PORTAL=1 firefox

deskutils/xdg-desktop-portal/Makefile

 PORTNAME=	xdg-desktop-portal
 PORTVERSION=	1.8.1
+PORTREVISION=	1
 CATEGORIES=	deskutils
 
 PATCH_SITES=	https://patch-diff.githubusercontent.com/raw/flatpak/xdg-desktop-portal/pull/:freebsd_compat

deskutils/xdg-desktop-portal/files/patch-zzz-disable_flatpak_and_snap

+Make it possible to run firefox with KDE filedialogs.
+
+The call for parse_app_info_from_flatpak_info uses the /proc/$PID/root
+file to access the flatpak information file.
+
+We neither have support for /proc/$PID/root nor flatpaks or snaps.
+
+With this fix and deskutils/plasma5-xdg-desktop-portal-kde it is now possible
+to run firefox using the KDE file dialogs.
+
+> GTK_USE_PORTAL=1 firefox
+
+--- src/xdp-utils.c.patched	2021-07-22 16:25:27.756116000 +0200
++++ src/xdp-utils.c	2021-07-22 16:30:51.814245000 +0200
+@@ -630,6 +630,11 @@
+   g_autoptr(XdpAppInfo) app_info = NULL;
+   g_autoptr(GError) local_error = NULL;
+ 
++// On FreeBSD the main use of the xdg-portal is to be able to use
++// "native" file dialogs, say the KDE file dialogs in firefox.
++// There is no support for the application package mechanisms like
++// flatpak and snap yet.
++#ifndef __FreeBSD__
+   app_info = parse_app_info_from_flatpak_info (pid, &local_error);
+   if (app_info == NULL && local_error)
+     {
+@@ -646,6 +651,7 @@
+           return NULL;
+         }
+     }
++#endif
+ 
+   if (app_info == NULL)
+     app_info = xdp_app_info_new_host ();