Remove $FreeBSD$: one-line sh pattern

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

usr.bin/fortune: convert to OBJTOP/SRCTOP idioms

- Use OBJTOP/SRCTOP-relative paths when looking for include files and
strfile.
- Add FORTUNES_OBJ and FORTUNES_SRC to abbreviate usr.bin/fortune
pathing.

This is being done to simplify make output/idioms.

MFC after: 1 week
Reviewed by: bdrewery
Sponsored by: Dell EMC Isilon
Differential Revision: D9916

Final step of eliminating the "games" distribution: Merge src/games
(or what's left of it, at least) into src/usr.bin.

This change will not be MFCed.

Discussed at: EuroBSDCon 2014
Committed from: EuroBSDCon 2015