Use the nix provided shell.

This is guaranteed to be bash, SmartOS has ksh by
 default and doesn't work.
SmartOS: Fix w3m build
Add missing patch

Forgot to add this in: 55665448a91b86a77ed0cb6112bf7c342395689e
Add missing patch

Forgot to add this in: 422210441ff1728968719fb3c9b311d946fd34a3
Tinc 1.1-git: user friendlier and works on SmartOS
Add HAProxy 1.5-dev21 with SSL, works on SmartOS.