MFH: r456561

Update libXfont ports.

Update libXfont to 1.5.4.
Update libXfont2 to 2.0.3.

This fixes several security vulnerabilities.

Security: 08a125f3-e35a-11e7-a293-54e1ad3d6335

		3b9590a1-e358-11e7-a293-54e1ad3d6335

Approved by: ports-secteam (delphij)