openacc: Fortran derived-type mapping fix

openacc: Fortran derived-type mapping fix

Fix a bug with mapping Fortran components which themselves have derived
types in the OpenACC 2.5+ manual deep-copy support.

2020-07-09  Julian Brown  <julian@codesourcery.com>

gcc/fortran/
	* trans-openmp.c (gfc_trans_omp_clauses): Use 'inner' not 'decl' for
	derived type members which themselves have derived types.

gcc/testsuite/
	* gfortran.dg/goacc/mapping-tests-3.f90: New test.
	* gfortran.dg/goacc/mapping-tests-4.f90: New test.