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)