1- We can cache the result of the first xbps_pkgdb_init() when it fails
and avoid the malloc/free/access from it.
2- We cache the uname(2) result into a private var in xbps_handle and
use it in xbps_pkg_arch_match().
This improves performance by ~5% approx and it's close as it was before
introducing the repository index format 1.5.
- xbps_repository_pool_find_pkg in best match case, now returns the
newest package version available in rpool.
- Added xbps_repository_pool_find_pkg_exact that returns a package
by exact matching a pkgver.
- Removed xbps_handle_alloc(), the user is free to use memory
allocated from heap or stack.
- Improved API documentation in preparation for 0.12.
Bumped XBPS_API_VERSION again.
