libxfce4utils to patch: strip trailing slashes from resources paths

[Jannis Pohlmann]

Hey guys,

I noticed that the new xfce4-settings-manager accidently lists all
settings dialogs twice. This is because I happen to have both
'/usr/share' and '/usr/share/' in XDG_DATA_DIRS. No idea why, but that
doesn't really matter.

I investigated this issue and found two things I'd like to improve:

  1. Use g_build_path instead of "%s/%s" in xfce-resource.c
     (libxfce4util) and xfce-settings-manager-dialog.c
     (xfce4-settings-manager).
  2. Remove trailing slashes from resource paths before duplicates are
     removed in _res_init() (in libxfce4util).

We already remove duplicate resource paths in _res_init() but IMHO not
consequently enough (e.g. '/usr/share' and '/usr/share/' are currently
not identified as duplicates). Attached is a patch which fixes the two
points mentioned above.

I'd like to commit this. Thoughts?

  - Jannis
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