Use loader_path instead of executable_path for osx

According to apple's documentation of rpath semantics, @executable_path means
that the path is relative the the *process executable*, not necessarily the
library in question. On the other hand, @loader_path is the path that points to
the library which contains the @loader_path reference. All of our rpath usage is
based off the library or executable, not just the executable. This means that on
OSX we should be using @loader_path instead of @executable_path to achieve the
same semantics as linux's $ORIGIN.

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