dns/c-ares: Update to 1.19.0 and switch to CMake

• Use GitHub as primary mirror for better connectivity and use main site as fallback
• Switch to CMake to provide .cmake files, improve compilation performance and adhere framework options Additionally also aligns port with other distributions such as Alpine, Arch, Fedora, MacPorts and openSUSE
• Drop CONFIG_INFO patch, this is no longer needed by UnrealIRCd
• Enable "make test", only build test suite when requested, disable online tests and use Googletest from tree instead of bundled version

Changelog: https://c-ares.org/changelog.html#1_19_0

PR: 268538
Reviewed by: zi (maintainer)