Delete some unused cmake defines

[am11]

Found with:

git grep cmakedefine ':/*.in' | while read x y z; do echo $y; done | sort -u |\
    while read x; do if ! git grep -q "$x" ':!*in' ':!*cmake'; then echo "$x";fi;done

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[steveisok]

I think we need this and perhaps the others. Is that correct, @lateralusX ?

[am11]

These are unused. When we need them lets add them then.

[steveisok]

In dotnet/runtime perhaps, but they may be used in forks. If that's the case, I'd rather keep it.

[am11]

Can you point me to the fork you are referring to? The dead code is deleted in this repo. If fork is using it, it should be kept there.

[steveisok]

It's non-public, unfortunately. I want to make sure it's even used there first. If it's not, then my comment is moot.

[lateralusX]

Not used so should be fine dropping and if ever needed in future we add it downstream.

[janvorli]

LGTM, thank you!