[cmake-developers] Fix get_item_rpaths function: gp_append_unique for each rpath returned by "otool" command

[Emilie]

Hello,

I attach a patch to fix the get_item_rpaths function (in BundleUtilities
module).

I had an error with fixup_bundle on osx: a rpath was added twice in the
install_name_tool command for "delete_rpath".
The command "otool" could return several rpath, so I call gp_append_unique
for each rpath.



Emilie
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