Modern distributions have the sbin directories on the end so users will expect them to be present for ThinLinc sessions as well.
This is $PATH on Ubuntu 14.04:
And on Fedora 20:
I think the Fedora approach of putting /sbin after /bin is safer, so let's go with that.
Fixed in r28879.
Verified using build 4332, PATH contains paths to sbin after bin...