[Mono.Security] Added Encode to AuthorityKeyIdentifierExtension and SubjectKeyIdentifierExtension.
[Mono.Security] Added AuthorityKeyIdentifierExtensionTest and SubjectKeyIdentifierExtensionTest.
L_cuserid was removed from OpenBSD.

This change released under the MIT license with permission from the original
author Christian Weisgerber.
Fixed TLAB_ACCESS_INIT usages in MSVC by declaring the variables explicitly at the start of each block.
Fixed SGEN_HASH_TABLE_INIT usages to work in MSVC.
Replaced C99 variable-length array with an alloca to work with MSVC.
Merge pull request #1061 from sethjackson/L_cuserid

L_cuserid was removed from OpenBSD.
Merge pull request #1057 from lextm/master

[Mono.Security] Added Encode to AuthorityKeyIdentifierExtension and Subj...
[Mono.Security] Add new test files (form previous PR) to the build