macOS: broken LC_RPATH with multiple INSTALL_RPATH entries
The macOS rpath editing operations implemented here may pass multiple RPATH entries in a single :
-separated string, but install_name_tool -add_rpath
seems to take only one value at a time. Passing a :
-separated list on OS X 10.11 generates a single LC_RPATH
entry with the entire list in it. Of course no such directory exists on disk, so the RPATH entry does not work.