add GOST algorithm support

The other #ifdef HAVE_* were moved in switches, so that they don't rely on being the last before default:

Support for configuring it in knot is intentionally not added.

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• 7d3edb3d - add GOST algorithm support

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This certainly needs some further review, but I tested it with (unmodified) knot-resolver on rootcanary.org:

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• e711afdf - tests: WIP fixup cases using GOST as invalid values

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marked as a Work In Progress

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I think there's bad memory allocation, due to not reading the API docs properly. I shouldn't write stuff so late.

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• d219bba8 - add GOST algorithm support

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unmarked as a Work In Progress

changed target branch from 2.7 to master

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• d219bba8...5e0d4939 - 69 commits from branch master
• da561555 - add GOST algorithm support

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merged

mentioned in commit 91e6e781

I'll need to redo this before knot release, as they made an incompatible change (resulting from my poking).

assigned to @vcunat