fate: Use the correct, local path to samples for opus reference files

This fixes running fate in configs where the samples are located
in a different path on the target.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit 'f9900822fc5f0b0c7242ca318290c090bd5d0af0'

* commit 'f9900822fc5f0b0c7242ca318290c090bd5d0af0':
  fate: Use the correct, local path to samples for opus reference files

Conflicts:
	tests/fate/opus.mak

See: ad7de82218e9ee2232e53ab49cda85767cf800e5
Merged-by: Michael Niedermayer <michaelni@gmx.at>
hevc: cleaning up, remove unused constants(cherry picked from commit 7eed32d076c57aa03011d65a64903e8bdb633978)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>