[og10] openacc: Character types and mixed arrays/derived type tests

[og10] openacc: Character types and mixed arrays/derived type tests

This patch adds some tests for character types that are components
of derived types used in OpenACC data-movement clauses (some of which
currently fail and are thus XFAILed), and tests (also XFAILed) mixing
arrays and derived types.  The XFAILs are addressed by follow-on patches.
Originally a combination of several mainline patches.

(cherry picked from commit b2d84e9f9cccbe4ee662f7002b83105629d09939)
(cherry picked from commit 9a4d32f85ccebc0ee4b24e6d9d7a4f11c04d7146)
(cherry picked from commit b0fb2720d88d680af18981a2097397196b505a1f)
(cherry picked from commit f7fb2f662fe12f327ece8b034ab76b36fdca4696)

gcc/testsuite/
	* gfortran.dg/goacc/array-with-dt-2.f90: New test.
	* gfortran.dg/goacc/derived-chartypes-1.f90: Likewise.
	* gfortran.dg/goacc/derived-chartypes-2.f90: Likewise.
	* gfortran.dg/goacc/derived-chartypes-3.f90: Likewise.
	* gfortran.dg/goacc/derived-chartypes-4.f90: Likewise.

libgomp/
	* testsuite/libgomp.oacc-fortran/array-stride-dt-1.f90: New test.