There was another case where it now was failing: "fs-utils-v1.00_1".
Previous code didn't take into account that a valid version might also
contain a non digit after '-'.
Added more tests to the testsuite to verify its correctness.
Make xbps_pkg_{name,version} return NULL if next character
after the last '-' character is not a digit, and if there's a digit
make sure that there exists a '_' character too.
Added more tests to the testsuite to catch this. With these changes
'python-e_dbus' is properly detected and validated.
Previous code incorrectly found obsolete files in this case:
(curpkg) - in files: /etc/foo.conf
(newpkg) - in conf_files: /etc/foo.conf
and removed this file because the code couldn't find it in the same
array. The new code fixes this case and compares the whole pkg filelist.
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.
