Drop support for sysvinit scripts

As announced by a few releases now, finally drop support for
sysvinit scripts.
Keep rc-local generator for now, as it's really a distinct
feature even though from the same era.

test/meson.build

@@ -65,16 +65,6 @@ endif
 
 ############################################################
 
-if want_tests != 'false' and conf.get('HAVE_SYSV_COMPAT') == 1
-        exe = executables_by_name.get('systemd-sysv-generator')
-        test('sysv-generator-test',
-             files('sysv-generator-test.py'),
-             depends : exe,
-             suite : 'sysv')
-endif
-
-############################################################
-
 if want_tests != 'false' and conf.get('HAVE_BLKID') == 1
         exe = executables_by_name.get('bootctl')
         test('test-bootctl-json',