lib: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .h pattern

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

ncurses: split libtinfo from libncurses

many external program expects libncurses to not be provided as a single
library. Instead of fixing all ports, distribute ncurses the way
upstream distributes it

Turn libncursesw.so into a ldscript which will link automatically as
needed to libtinfow so so this change is seamless at compile time.

Differential Revision: https://reviews.freebsd.org/D32098