Merge the [pgoyette-compat] branch

branches: 1.17.62;
Include <sys/exec_aout.h> explicitly instead of relying on <sys/exec.h> to
do it for you.

#include "opt_execfmt.h" and only compile innards if EXEC_AOUT is defined.

branches: 1.15.16;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

branches: 1.14.44; 1.14.46; 1.14.56;
merge ktrace-lwp.

branches: 1.13.4;
nuke trailing whitespace

Don't try to map a 0 size bss.

branches: 1.11.8; 1.11.10;
Don't include malloc.h if you are not going to use it.

- GC all the setup_stack functions
- add one for linux/i386

branches: 1.9.2;
Use PAGE_SIZE rather than NBPG.

Rename __LDPGSZ to AOUT_LDPGSZ, to accurately reflect what it is.

count executable image pages as executable for vm-usage purposes.
also, always do the VTEXT vs. v_writecount mutual exclusion
(which we previously skipped if the text or data segment was empty).

remove trailing \n in panic(). approved perry.

branches: 1.5.10;
add RCSIDs (including regeneration of files as appropriate)

- Add a new vnode flag VEXECMAP, which indicates that a vnode has
executable mappings. Stop overloading VTEXT for this purpose (VTEXT
also has another meaning).
- Rename vn_marktext() to vn_markexec(), and use it when executable
mappings of a vnode are established.
- In places where we want to set VTEXT, set it in v_flag directly, rather
than making a function call to do this (it no longer makes sense to
use a function call, since we no longer overload VTEXT with VEXECMAP's
meaning).

VEXECMAP suggested by Chuq Silvers.

branches: 1.3.2; 1.3.4; 1.3.8;
remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

add a new function vn_marktext() for exec code to let others know
that the vnode is now being used as process text.

branches: 1.1.26; 1.1.30;
- Moving cpu_exec_aout_prep_oldzmagic -> exec_aout_prep_oldzmagic.
This is used by the i386, hp300 and mac68k ports.
- Added exec_aout_prep_oldomagic, and exec_aout_prep_oldnmagic
These are just copies of the respective prep functions from
kern_exec.c with text address starting at 0. Maybe a better fix
is to pass the starting address as a third argument so we don't
duplicate code, but this could be the next pass since the functions
are used in many places. These functions are used for BSDI binaries.