Fix race condition in werror2.test due to sanity sleep change. * tests/werror2.test: Generate Makefile.in before configure so that a Makefile.am update after configure has run is guaranteed to be newer than Makefile.in. * tests/subdir5.test: Document why this test does not need to be fixed. * tests/subdir8.test: Likewise. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>