[OE-core] [PATCH 0/2] RPATH host pollution fixes

[Andy Ross]

Results from chasing the RPATH pollution I was seeing:

I don't have a fix for the underlying linker issue, but that is
captured here:

  https://bugzilla.yoctoproject.org/show_bug.cgi?id=2965

Patch 1 is the warning fix from earlier, which is still a fix to the
existing logic and should be applied.  I've removed the
"host-polluted" text though, as AFAICT the actual RPATH is not a
problem, only the use of -rpath with the linker that produced it.

Patch 2 is a fix to libtool on top of the existing fix-rpath.patch to
normalize the strings.  With this applied, all the link failures we
have reproduced (including the one reported vs. owl_video last week)
work correctly.  No libraries in the resulting sysroot have a RPATH
set to a default link directory.

A few runnable binaries still trigger the warning though (but
otherwise build successfully), I'm looking at that now -- I suspect
these simply aren't using libtool, or else we've missed a spot where
normalization and/or default directory pruning needs to happen.

Andy