[Patch, Fortran] PR31917 - fix GFORTRAN_CONVERT_UNIT support

[Tobias Burnus]

:ADDPATCH fortran:

Test case, see: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31917
To test it, try some settings following
http://gcc.gnu.org/onlinedocs/gfortran/GFORTRAN_005fCONVERT_005fUNIT.html

Setting the default conversion via the GFORTRAN_CONVERT_UNIT environment
variable was not possible. The problem is that  do_parse() was using its
own private "def" variable instead of the global one. In addition, it
was only set for GFORTRAN_CONVERT_UNIT="<convert>;" without the
semicolon, it was ignored.

GFORTRAN_CONVERT_UNIT supports exceptions of the kind: "<convert>:<unit
range>", however, for the exceptions only little_endian and big_endian
was supported not NATIVE or SWAP.

Build and  regression tested on  x86_64-unknown-linux-gnu.

Ok for the trunk?

Tobias
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