RethinkDB 1.7.2

Closes #21320.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
juise 0.5.6

Closes #21308.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
libslax 0.16.15

Closes #21307.

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