Support automatic checksums for ARM files

[AdmiringWorm]

Chocolatey have plans to add support for the ARM architecture.
As such it would be useful to have the automatic checksum feature supporting this when it is available in chocolatey.

Ref issue: chocolatey/choco#1803

/cc @majkinetor

[majkinetor]

I am not sure I want to continue developing automatic checksum. Although it mostly works that monkey patching is... argh...

Should be easy to fix when this feature arrives.

I almost never use it, but I am biased to embedded packages that do not require it...