Currently, the darwin shlibs detection is done by parsing the .la file
dependency fields. This is very old code and is incomplete in some
cases so convert to using otool -l and otool -L to correctly load
the rpath and dependency information.
(From OE-Core rev: e27573b6c3562662e4b2f5d8543eb7d150c3bc92)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>