pv-adverb: Create the intended symlinks for VDPAU drivers
We can only add one directory to the search path for VDPAU drivers, so
to support both 32- and 64-bit, we have to multiplex via ld.so dynamic
string tokens like ${PLATFORM}
. Unfortunately, we were creating symbolic
links pointing to paths like /overrides/x86_64-linux-gnu/vdpau (no "lib"
infix) rather than the correct /overrides/lib/x86_64-linux-gnu/vdpau,
so the VDPAU driver would not actually have been found.
Fixes: 4f3d2d4b "pv-runtime: Delegate setup of VDPAU to pv-adverb"
Needs testing, but I think this is a correct change.
/cc @refi64