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utils.portage: match the tag prefix when the version is renamed

The tag pattern check locates the version inside the SRC_URI file name
by searching for the ebuild version. An ebuild that renames the version
through MY_PV never matches, and the check then imposed no pattern at
all, so every tag in the repository competed.

games-emulation/dosbox-x fetches `dosbox-x-v${MY_PV}.tar.gz` with MY_PV
well behind PV, which left the unrelated `dosbox-x-wip-20180715-1600`
tag in the running. Its date reads as version 20180715.1600, and Portage
compares the first component, so it beat every release and the ebuild was
renamed from 2026.3.29 down to 20180715.1600.

Fall back to the fixed text before the version, `dosbox-x-v` here, and
require candidates to start with it. A prefix that is only a `v` marker
is ignored: dev-python/underthesea-core refers to `v8.3.0` while the
newest tag is `underthesea-v9.5.0`, and treating `v` as a scheme would
hide it.

Checked against the whole overlay with the ebuild version held constant:
of 465 packages, only dosbox-x changes, from 20180715.1600 to 2026.7.2.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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