Add clrcompression static library

[nxtn]

Contributes to dotnet/corert#5496

Uses the lib prefix per dotnet/core-setup#8659

[jkotas]

We do this for all other libraries shim currently and this one is the only outlier. It is something we may need to revisit in future.

[jkotas]

Related #3447

[janvorli]

@NextTurn I have a couple of questions:

• Why do we add the lib prefix on Windows? This naming convention is Unix only.
• If we really want to do that for some reason, why don't we use the PREFIX property to do that instead of setting the PREFIX to an empty string and modifying the OUTPUT_NAME?

[nxtn]

Why do we add the lib prefix on Windows? This naming convention is Unix only.

There is already a clrcompression.lib on Windows serving as an import library. The lib prefix is taken from a similar library libnethost.lib as per discussion in dotnet/core-setup#8659.

If we really want to do that for some reason, why don't we use the PREFIX property to do that instead of setting the PREFIX to an empty string and modifying the OUTPUT_NAME?

Setting the PREFIX to lib seems to work as well... I'll take another look later.

[nxtn]

How about we set PREFIX to lib and then OUTPUT_NAME to clrcompression?

[janvorli]

Hmm, I have not realized before that we need to set the output name anyways, as it would be clrcompression-static by default. So I guess it is not worth the hassle to spend time changing it to set the PREFIX to lib. Please feel free to keep it as is.