MFH: r532101

cad/fidocadj: unbreak and unexpire by switching to GitHub.

• update the accompanying PDF to version 0.24.6 too
• use DIST_SUBDIR
• clean up Makefile

PR: 245368
Submitted by: rene
Approved by: maintainer timeout (nivit, 14 days)

Approved by: ports-secteam (joneum)