patchelf: Fix corrupted file mode patch

The recent patchelf upgrades corrupted the file permissions patch we
carry as upstream inserted an early exit to the funciton.

This showed up as corrupted file modes when testing a new uninative tarball
containing this patchelf.

Rework and tweak the patch to fix this.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>