Add virtual packages to be considered in the solver

[ericpre]

This is an attempt to be fix #9896 and this issue should also applied to all virtual packages. I don't know if this is the right approach but adding virtual packages to specs_map seems to work!

[jakirkham]

Thanks Eric! 😀

cc @beckermr

[beckermr]

Thanks @jakirkham!

[ericpre]

Two tests are failing because of a change in the reported error message changed and is now different from the expected one. Once it is confirmed that the approach is right, I can look into fixing it.

[beckermr]

@jjhelmus @kalefranz @chenghlee any comments here?

[mcg1969]

This looks good but it strikes me we should have a test for this.

[ericpre]

I added a test and adapted two other tests. Appveyor is having hiccups (tests are passing fine but appveyor says Command exited with code 7!) and other than it should be good now.

[jakirkham]

Would it be possible to get another review of this?

[github-actions]

Hi there, thank you for your contribution to Conda!

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