[patch, fortran] Fix PR 52668, bogus warning for only list

[Thomas Koenig]

Hello world,

this fixes a 4.7/4.8 regression with a bogus warning for variables
which were excluded from being imported by "use, only" if they
were in a common block inside the module.

Regression-tested.  OK for trunk and for 4.7 after a few days?

	Thomas

2012-03-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/52668
         * module.c:  Only mark symbols as use_only if they have been
         imported via an only list.

2012-03-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/52668
         * gfortran.dg/use_only_6.f90: New test.
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