ncurses: serialize the tinfo build a little bit

Move ncurses_dll.h to GENHDRS to start with; it's been generated from
ncurses_dll.h.in for years, so it's not actually in a different category
than all of the other GENHDRS. Slap an .ORDER on it to ensure that we
build ncurses_dll.h and curses.h before any *.c gets compiled.

This should sufficiently address a build race seen downstream where
ncurses_dll.h is present but not yet populated.

Reviewed by: bapt
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D43540

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

ncurses: Silence -Wunused-but-set-variable for various files.

Presumably these will be fixed upstream eventually.

Differential Revision: https://reviews.freebsd.org/D40664

Fix building host tools for host

Several makefile depend on tools built for host.
At least when using DIRDEPS_BUILD we can build these for the
pseudo machine "host" to facilitate building on older host versions.

Ideally we would build these tools in their own directories to avoid
building more than needed.

For now, setting an appropriate default for BTOOLSPATH will suffice

Reviewed by: stevek
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D39708

Install working pkgconfig .pc files for compat libraries

The default ones are install them to /usr/libdata/pkgconfig, and we can't
use this path for compat libraries, so we use /usr/lib<suffix>/pkgconfigi here.

Test Plan: grep -rn libdir= ./usr/lib32/pkgconfig/*.pc
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D34939

ncurses: add SRCHDRS (ncurses_dll.h) to tinfo SRCS

This avoids relying on the `includes` target to generate this header
which must be in .OBJDIR for the ncurses library to find it.

With an upcoming change libcompat build won't build a seperate
sysroot and will instead share with the 64-bit target which means the
`includes` target will not be called.

Sponsored by: DARPA, AFRL

Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D35510

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