Adapt libgomp acc_get_property.f90 test

Adapt libgomp acc_get_property.f90 test

The commit r10-6721-g8d1a1cb1b816381bf60cb1211c93b8eba1fe1472 has changed
the name of the type that is used for the return value of the Fortran
acc_get_property function without adapting the test acc_get_property.f90.

2020-02-21  Frederik Harwath  <frederik@codesourcery.com>

	* testsuite/libgomp.oacc-fortran/acc_get_property.f90: Adapt to
	changes from 2020-02-19, i.e. use integer(c_size_t) instead of
	integer(acc_device_property) for the type of the return value of
	acc_get_property.