Test that automake and meson have the same tests
This commit adds a new test. This test is a shell script that extracts the lists of tests from Makefile.sources and meson.build and compares them. The test fails if the two have different lists of tests. The script does not check if the conditions for when a test is included are the same. If anyone wants to add that, feel free. For a first version of this script, just checking the list of files is hopefully enough. As with the other shell script based tests that we have (see src/*sh), this test is only run by autotools. Signed-off-by: Uli Schlachter <psychon@znc.in>