Small changes to the ebuild as the Debian patches don't have any functional
changes in _p28 vs _p29:
* Use the 'series' file directly to get the patch order
* Use edo in src_test
* Fix typo in comment line, making it a non-comment, in configure
Closes: https://bugs.gentoo.org/976124
Signed-off-by: Sam James <sam@gentoo.org>