Add test for the fix for PR24410

Add test for the fix for PR24410

PR24410 was fixed by these recent commits:

    1b83138 Propagate private type diff category through refs/qualified type diffs
    dc84fee Fix anonymous union constructed under the wrong context
    522ac25 Internal pretty repr of union cannot be flat representation

But then I forgot to add a regression test for that issue.

This patch does that.

	* tests/data/test-diff-pkg/PR24410-new/poppler-debuginfo-0.73.0-8.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-new/poppler-qt5-0.73.0-8.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-new/poppler-qt5-debuginfo-0.73.0-8.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-new/poppler-qt5-devel-0.73.0-8.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-old/poppler-debuginfo-0.73.0-4.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-old/poppler-qt5-0.73.0-4.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-old/poppler-qt5-debuginfo-0.73.0-4.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-old/poppler-qt5-devel-0.73.0-4.fc30.x86_64.rpm:
	Add new test input.
	* tests/data/test-diff-pkg/PR24410-report-0.txt: Add new test
	input.
	* tests/data/Makefile.am: Add the test input above to source
	distribution.
	* tests/test-diff-pkg.cc: Make this test harness use the new input
	rpms above.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>