[getdns] Add new port.

[banburybill]

Add new port for getdns (https://getdnsapi.net).

• What does your PR fix? Fixes [New Port Request] getdns #12075

• Which triplets are supported/not supported? Have you updated the CI baseline?
  All CI failures appear to be in other packages. I have verified x64-windows, x86-windows, x64-windows-static and x86-windows-static build.

• Does your PR follow the maintainer guide?
  I think so. Two of the 3 patches applied are submitted upstream, the other is waiting for a response from the chief maintainer on whether it's a CMakeLists.txt problem or a packaging problem.

[ghost]

All CLA requirements met.

[NancyLi1013]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[NancyLi1013]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[NancyLi1013]

The failures on x64-uwp and arm-uwp triplets:

4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\platform.c(56,17): error C4996: 'sprintf': This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]
         ub_loop.c
     4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\anchor.c(108,6): error C4996: 'sscanf': This function or variable may be unsafe. Consider using sscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]
     4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\anchor.c(122,6): error C4996: 'sscanf': This function or variable may be unsafe. Consider using sscanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]
     4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\anchor.c(972,3): error C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]
     4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\anchor.c(977,3): error C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]
     4>D:\buildtrees\getdns\src\1.6.0-ba09677cce\src\convert.c(1649,10): error C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details. [D:\buildtrees\getdns\x64-uwp-dbg\getdns_objects.vcxproj]

Could you please look into this and try to fix it?

[banburybill]

There's at least one Win32 API being used in GetDNS which is not supported in UWP. I don't have time to properly investigate and correct this myself right now, so for the moment I've marked it as not supported under UWP and filed a bug with upstream.

[NancyLi1013]

Have you tested these features? Can these work well?

[ras0219-msft]

LGTM, thanks for the PR!