non-openssl build fixes

[Reuben Hawkins]

The attached patches fixes and cleans up the build when configured
with --without-openssl.

Summary:
* Fix KEX_SERVER_ENCRYPT macro in myproposal.h
* Fix unresolved symbols in ssh-keygen.c
* Isolate openssl code and extend WITH_OPENSSL wrappers around it
* Make ed25519 default key type in ssh-keygen when configured --without-openssl
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