While adding python{,3}-packaging to the build requirements, I
suspected that the build instructions hadn't actually been tested
recently. So I checked, found problems, and corrected them.
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
If you do a `./autogen && ./configure --with-config=srpm && make dist` without having `git` installed, you will get a `ZFS_META_GITREV=unknown` value. To fix this, add `git` as a dependency.
