Fixes CVE-2025-23395, CVE-2025-{46802,46803,46804,46805}.
* gnu/packages/screen.scm (screen): Update to 5.0.1.
[source]: Download using git-fetch. Add a snippet.
[native-inputs]: Replace autoconf with autoconf-2.71.
[arguments]: Add a phase to change into the source directory.
* gnu/packages/patches/screen-hurd-path-max.patch: Adjust for building
from git.
Change-Id: Ie6eceac0f14b5b94c47aee01d770f7e42a71416e