[Patch, fortran] Document more environment variables in gfortran.texi

[Tobias Burnus]

:ADDPATCH fortran:

Tobias Burnus wrote:
>> I just found this in an old patch of mine. We were missing quite a lot
>> of environment variables in the documentation.
>>     
> Of which the most don't work.
>   
See PR fortran/32021. Below you find the patch which documents the
backtrace/coredump support, which was added by FX.

Ok for the trunk only (as it is not implemented in 4.2.x)?

Tobias

2007-05-21  Tobias Burnus  <burnus@net-b.de>

	* gfortran.texi: Document the GFORTRAN_ERROR_DUMPCORE and
	  GFORTRAN_ERROR_BACKTRACE environment variables.

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