telegram-desktop: fix cve-2026-107181

[JkktBkkt]

Testing the changes

• I tested the changes in this PR: briefly

Local build testing

• I built this PR locally for my native architecture, x86-64
• I have not built this PR locally for other architectures, am relying on CI from this PR

As seen on https://bugs.gentoo.org/983963#c8, applying just this patch should fix the vulnerability, which means we can postpone packaging 7.2.9+ version of telegram-desktop (doing so is non-trivial due to new dependencies, attempted by ar-jan with LLM use: https://github.com/ar-jan/void-packages/tree/telegram730)

Credit to ar-jan for bringing this issue up.

[JkktBkkt]

I dropped the conditional nocross in (different wordsize of host and target machines) and was able to build for armv{6,7}l{,-musl} with no further changes necessary locally.

Unfortunately I do not have a way to properly test those resulting builds.

[JkktBkkt]

aarch64-musl failure is unrelated to changes in this PR and that build succeeded with previous push (when the nocross condition was still in the template, which doesn't apply to aarch64-musl builds on x86_64-musl host)
That run can be seen here: https://github.com/void-linux/void-packages/actions/runs/38069043307/job/114262516582