Do not check for NET5_0_OR_GREATER

[radekdoulik]

Context: Fixes#777

Looks like this define will not be added, so check for NET instead.

[jpobst]

Due to a lot of confusion and concern we ended up not shipping this design.

I think this sentence refers to the alternative proposed in the QA question.

I think the actual issue is that NET5_0_OR_GREATER hasn't been added to .NET 5 yet given that this design was accepted 2 months ago. I think we will need to do #if !NET5_0 AND !NET5_0_OR_GREATER (pseudo-code).

[radekdoulik]

I think we will need to do #if !NET5_0 AND !NET5_0_OR_GREATER (pseudo-code).

That would not work, as on net6 we have these defines now (plus non-related other defines): NET;NET6_0;NETCOREAPP.

So I think checking for the NET should be fine for now.

[jpobst]

Yeah, looks like that should work. The way I originally read the document made me think NET would be defined for net472 TFM.