Virtuoso 6.1.7

Closes #21400.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
remctl: update URL

Closes #21410.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Multimarkdown 4.2

Closes #21407.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
aria2: fix compilation on Clang 5

Closes #21356.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>