[patch, fortran] Fix PR 78021

[Thomas Koenig]

Hello world,

this rather self-explanatory patch fixes a problem where two
function invocations with 'c    ' and 'c' as arguments
were considered equal.

Regression-tested.  OK for trunk and 6 and 5 branches?

Regards

	Thomas

2016-10-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/78021
         * gfc_compare_functions:  Strings with different lengths in
         argument lists compare unequal.

2016-10-22  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/78021
         * gfortran.dg/string_length-3.f90:  New test.
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