bump build, add license files, minor fixes

[mattip]

• add licenses for OpenBLAS, LAPACK, libgfortran, libquadmath (fixes #114)
• fix wheel renaming for arm64 (fixes #113)
• remove unused pkgconfig info (fixes #113)
• add libc env variable on travisCI aarch64 builds for musllinux

I bumped the version to 0.3.23.293.1, I hope that is valid.

[mattip]

Closing, using wrong branch (main)