[patch, Fortran] Fix PR 60526, variable name has already been declared as a type

[Thomas Koenig]

Hello world,

For a type 'foo', we use a symtree 'Foo'. This led to accept-invalid
when a variable name was already declared as a type.  This rather
self-explanatory patch fixes that.

Regression-tested.  OK for trunk and 5?  (Do we still care about 4.9?)

Regards

	Thomas


2016-02-03  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/60526
         * decl.c (build_sym):  If the name has already been defined as a
         type, issue error and return false.

2016-02-03  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/60526
         * gfortran.dg/type_decl_4.f90:  New test.
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