devel/ffcall: Rename to libffcall (renamed upstream)

[ultima]

Summary

• Renamed ffcall --> libffcall, renamed upstream

PR\: 220905
Sumitted by\: Jov <[e-mail]> (maintainer)
Reviewed by\: lifanov (mentor), matthew (mentor)
Approved by\: lifanov (mentor), matthew (mentor)
Differential Revision\: https://reviews.freebsd.org/DXXXXX

Test Plan

portlint:
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 1 warning found.

poudriere:
103i386
103amd64
110i386
110amd64
12i386
12amd64

[ultima]

The diff doesn't seem right, I used svn mv ffcall libffcall, everything looks right just the diff it generated looks wrong, used

arc diff --create MOVED devel/Makefile lang/gforth lang/qscheme devel/ffcall devel/libffcall

to generate.

[matthew]