Thanks Matthias for the self-contained testcase, it was a massive help.

The problem appears to be caused by out-of-range Thumb-2 branches to
a PLT entry.  The linker correct redirects the branch to a stub, but it doesn't
then record that the relocation has been resolved (i.e. doesn't need a
dynamic counterpart).

The patch that I'm about to attach fixes the bogus error, but it looks like
the error would trigger whenever these stubs are used with PLTs.  I'm therefore
a bit worried that the PLT/stub combination seen in these two packages
might not have had much execution testing.

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https://bugs.launchpad.net/bugs/641126

Title:
  unresolvable R_ARM_THM_CALL relocation

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