lcov: update to 2.5.

[dora-meowmeow]

Testing the changes

• I tested the changes in this PR: YES

I tested this by running coverage test on my game engine's test projects. Everything seemed sane from my tests. The tests were done with C++23.

I also removed the patches, as they are no longer relevant. I have checked if other distributions like debian or arch patch lcov, but from what I can tell they don't patch anything either.

New package

• This new package conforms to the package requirements: YES

New package perl-Devel-Cover was necessary as it is a dependency (see)

However, according to linux-test-project/lcov#370 (comment), Memory::Process is not a hard dependency. Debian and Gentoo seems to skip this package, so I skipped adding it as well.

Local build testing

• I built this PR locally for my native architecture, (x86_64-glibc)
• I built this PR locally for these architectures (if supported. mark crossbuilds):

[dora-meowmeow]

I am not 100% sure regarding the licenses. Perl does licensing very weirdly. I might have messed up.

[dora-meowmeow]

checks depend on Date::Parse which isn't on void repo... sigh I'll be back.
according to cpan it is in perl-TimeDate package (see)