audio/playgsf: Remove packaged static library which circumvents Makefile

It appears that the static resample library should not have been part
of the distribution tarball. It's presence causes libresample.a not to
be built and to be used instead. It was detected by DF's ar programs
which reported it as malformed. Fix the distribution issue by removing
the pre-existing library and force it to be rebuilt.

Approved by: just-fix-it