Harfbuzz, libgcrypt, SDL and libssh updates

The following projects have been updated:

• Harfbuzz was updated to 2.0.2 then to 2.1.0 then to 2.1.1.
• libgcrypt was updated to 1.8.4.
• libssh was updated to 0.8.5.
• SDL was updated to 2.0.9.

Any projects that have a dependency that was updated has also been updated to build with the latest versions of the new libraries as well.