x11-fonts/xfsinfo: Update to 1.0.6

Update x11-fonts/xfsinfo to 1.0.6
Add license information

This release fixes a bug in 64-bit builds which caused the maximum
request size to be incorrectly calculated.

Changelog:
https://lists.x.org/archives/xorg/2019-February/059612.html

PR: 235889
Submitted by: Samy Mahmoudi
Sponsored by: B3 Init (zeising)