PR c++/5287, PR c++/7910, PR c++/11021 * testsuite/g++.dg/ext/dllimport1.C: Add mingw32 as target. Add tests for warnings. * testsuite/g++.dg/ext/dllimport2.C: Add tests for warnings. * testsuite/g++.dg/ext/dllimport3.C: Likewise. * testsuite/g++.dg/ext/dllimport4.C: New file. * testsuite/g++.dg/ext/dllimport5.C: New file. * testsuite/g++.dg/ext/dllimport6.C: New file. * testsuite/g++.dg/ext/dllimport7.C: New file. * testsuite/g++.dg/ext/dllimport8.C: New file. * testsuite/g++.dg/ext/dllimport9.C: New file. * testsuite/g++.dg/ext/dllimport10.C: New file. * testsuite/g++.dg/ext/dllexport1.C: New file. From-SVN: r68917
