[patch] general updates and improvements to QNX NTO support

[Kris Warkentin]

Sorry about the vagueness of the patch description.  I've been working 
on this off and on for a while but I've been lazy about submitting.  By 
and large, most of this is just about being able to switch targets to 
future-proof against a multi-arch gdb.

Also I've created hooks for recognizing when we're dealing with a 
Neutrino target.  Unfortunately there is no nice way to recognize our 
binaries so I have to fall back on cheating.

A few other things are there as well such as an 'in_dynsym_resolve_code' 
for better solib support, a core sniffer and some assorted 
re-arrangement of things.

I had started getting rid of some of the deprecated things (core_fns) 
but was having trouble so I ripped that part of the patch out to work on 
and submit later.  Looks like I'm also going to have to get rid of 
to_xfer_memory.

cheers,

Kris

ChangeLog entry:
2004-11-19  Kris Warkentin  <kewarken@qnx.com>

    * nto-tdep.h: Include osabi.h.  Prototypes for generic Neutrino
    osabi sniffer, signal handling initializer and
    'in_dynsym_resolve_code' function.
    (struct nto_target_ops): Put comments inline with struct.  Add osabi
    sniffer hook.  Redefine macros to permit testing/assignment.
    * nto-tdep.c (nto_find_and_open_solib): Allocate all buffers
    dynamically to support arbitrary root paths.  Check for basename of
    lib in search path and then check for absolute.
    (nto_in_dynsym_resolve_code): New function.
    (nto_core_sniffer): New function.
    (regset_core_fns): Register core sniffer.
    (nto_initialize_signals): New function.
    (_initialize_nto_tdep): Move signal initialization code to above to
    avoid initialization race conditions.
    * nto-procfs.c: Minor formatting/indenting changes.
    (procfs_is_nto_target): New function.
    (procfs_open): Set nto_is_nto_target.
    (_initialize_procfs): Ditto.  Remove notice_signals() call to avoid
    initialization race conditions.
    (procfs_create_inferior): Resume inferior after creation.
    * i386-nto-tdep.c (init_i386nto_ops): Use new macros for assignment.
    (i386nto_init_abi): Initialize signals.  Set
    TARGET_SO_IN_DYNSYM_RESOLVE_CODE.
    (_initialize_i386nto_tdep): Register osabi sniffer.
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