[Crash-utility] "gdb" by itself ought to put crash into a "gdb" mode

[Bruce Korb]

On 03/14/12 06:37, Dave Anderson wrote:
>> Possible?  Thanks !  Regards, Bruce
>
> Definitely sounds possible.  Maybe create a new "gdb" environment
> variable that can be flipped with "set gdb on/off" commands.  Then
> check for the mode in process_command_line() and exec_input_file()
> and insert/shift the "gdb" string into args[0].

I did the patch as a "flags2" flag bit.
"gdb_cmd()" already leaves the first bytes of the command alone,
but I found it difficult to leave it alone.  I eliminated the
extra copy....
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