[patch, fortran] Fix PR 48847, bogus "unused parameter" warning

[Thomas Koenig]

Hello world,

the attached, rather obvious patch fixed a bogus "unused parameter"
warning with procedure dummy arguments and warns about these if
they occur.

Regression-tested.  OK for trunk?  Or rather wait until 4.8?

	Thomas

2012-02-05  Thomas König  <tkoenig@gcc.gnu.org>

         PR fortran/48847
         * trans-decl.c:  Warn about unused dummy procedure arguments
         if -Wunused-dummy-argument is specified.  Suppress middle-end
         warnings about procedure arguments.

2012-02-05  Thomas König  <tkoenig@gcc.gnu.org>

         PR fortran/48847
         * gfortran.dg/warn_unused_dummy_argument_3.f90:  New test.
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