XBPS 0.29 released

A new XBPS stable version has been released: 0.29. This is a minor bugfix release that is fully compatible with musl C library.

Release notes:

Added XBPS_ARCH environment variable to override tha native architecture (uname(2) machine). This allows us to use “fake” architectures, for example to use packages built for a different C library.
Miscellaneous fixes to make XBPS work with the musl C library.
Fixed issue #27