Log Message:
Update ucblogo to ucblogo-5.3. Many changes from older 4.6. No
change log found other than "This is a maintenance release, just
fixing a few disastrous bugs introduced in the 5.2 release." (Which doesn't
matter for this.)

Use BUILDLINK3 system.
Uses ncurses (or libtermcap).
Add HOMEPAGE.
Change MASTER_SITES, because not at GNU mirrors yet.
Also install some documentation.

Update PLIST; now using share/ucblogo instead of share/logo.

Removed un-needed patches.

New patch-aa for makefile.in also makes sure that emacs logo-mode
is disabled; if you want an option for this, please do so.

This will close a PR #24858 because now ucblogo does build under Linux.

Tested under Linux and NetBSD 1.6.2. Used graphical interface
with "showturtle" and did some minor line drawings.