Change RID of OpenCvSharp4.runtime.linux-arm to linux-arm64

[hjtroteclaser]

Hi.
Newest OpenCV version is 64 bit only, also Arm is 64 bit.
When using nugets for linux-arm build the suggested RID is 'linux-arm64' and all other nugets i use and know use this runtime identifier.
But when also using 'OpenCvSharp4.runtime.linux-arm' nuget, runtimes are not copied, because of different runtime in nuget.

I suggest to change the RID/runtime of 'linux-arm' to 'linux-arm64' as it is also with 'linux-x64'.
This includes

• the nuget name/id
• nuget runtime path 'runtimes/linux-arm/native/' to 'runtimes/linux-arm64/native/'.

The build and tests run already with -r linux-arm64.

The minimum would be changing or duplicating the runtime path in nuget to 'runtimes/linux-arm64/native/'.

some rid graph

linux-arm64     linux-x64
     |     \   /     |
     |     linux     |
     |       |       |
unix-arm64   |    unix-x64
         \   |   /
           unix
             |
            any

[shimat]

Fixed in PR #1871 (merged). The NuGet package has been renamed to OpenCvSharp4.runtime.linux-arm64 with the native library now correctly placed under runtimes/linux-arm64/native/, matching the RID used by .NET on ARM64 targets.