[fortran, patch] Make VOLATILE conflict with program name

[Tobias Burnus]

:ADDPATCH fortran:

currently, one can write:
  program test
    volatile :: test
which does not make much sense.

Added patch adds conf(volatile_) to:
    case FL_PROGRAM:
    case FL_BLOCK_DATA:
    case FL_MODULE:
    case FL_LABEL:

Ok for the trunk?
Regtested on x86_64-unknown-linux-gnu

Tobias
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