Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Convert to usr.bin/ to LIBADD
Reduce overlinking

Convert LIBCURSES to LIBNCURSES to fix "make checkdpadd"

Also, add a missing LIBPANEL dependency for lldb

Approved by: rpaulo (mentor)
Suggested by: brooks
MFC after: 5 days
Phabric: D675 (as part of a larger diff)
PR: 192762

Sync with OpenBSD.

MFC after: 2 weeks

Add the Clang specific -Wmissing-variable-declarations to WARNS=6.

This compiler flag enforces that that people either mark variables
static or use an external declarations for the variable, similar to how
-Wmissing-prototypes works for functions.

Due to the fact that Yacc/Lex generate code that cannot trivially be
changed to not warn because of this (lots of yy* variables), add a
NO_WMISSING_VARIABLE_DECLARATIONS that can be used to turn off this
specific compiler warning.

Announced on: toolchain@

Use libedit when interacting with tty, which provided history
functionality, etc. as did by GNU bc.

This also fixes an issue where BSDL bc can not handle very long
line.

Reported by: imp
Reviewed by: imp

- style.Makefile(5)

Submitted by: uqs
Approved by: delphij (mentor)

Move USD documents from /usr/share/doc/papers to to /usr/share/doc/usd.

Reviewed by: gabor

Makefile cleanups:

o Enable building of USD
o Remove commented out targets
o Remove WARNS?=6 lines since it's the default

Reviewed by: gabor

Replace GNU bc/dc with BSDL versions ported from OpenBSD. They have a good
compatibility level with the GNU counterparts and have shown to be mature
enough. For now, the GNU versions aren't removed from the tree, just detached
from the build.

Sponsored by: Google Summer of Code 2008
Portbuild run by: erwin
Approved by: delphij