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.

meson.build

@@ -90,10 +90,6 @@ conf.set10('HAVE_SPLIT_BIN', split_bin,
 
 have_standalone_binaries = get_option('standalone-binaries')
 
-sysvinit_path = get_option('sysvinit-path')
-sysvrcnd_path = get_option('sysvrcnd-path')
-conf.set10('HAVE_SYSV_COMPAT', sysvinit_path != '' and sysvrcnd_path != '',
-           description : 'SysV init scripts and rcN.d links are supported')
 sysvrclocal_path = get_option('rc-local')
 conf.set10('HAVE_SYSV_RC_LOCAL', sysvrclocal_path != '')
 conf.set10('CREATE_LOG_DIRS', get_option('create-log-dirs'))
@@ -303,8 +299,6 @@ conf.set_quoted('SYSTEM_GENERATOR_DIR',                       systemgeneratordir
 conf.set_quoted('SYSTEM_PRESET_DIR',                          systempresetdir)
 conf.set_quoted('SYSTEM_SHUTDOWN_PATH',                       systemshutdowndir)
 conf.set_quoted('SYSTEM_SLEEP_PATH',                          systemsleepdir)
-conf.set_quoted('SYSTEM_SYSVINIT_PATH',                       sysvinit_path)
-conf.set_quoted('SYSTEM_SYSVRCND_PATH',                       sysvrcnd_path)
 conf.set_quoted('SYSTEM_SYSVRCLOCAL_PATH',                    sysvrclocal_path)
 conf.set_quoted('SYSUSERS_DIR',                               sysusersdir)
 conf.set_quoted('TMPFILES_DIR',                               tmpfilesdir)
@@ -2431,7 +2425,6 @@ subdir('src/system-update-generator')
 subdir('src/systemctl')
 subdir('src/sysupdate')
 subdir('src/sysusers')
-subdir('src/sysv-generator')
 subdir('src/timedate')
 subdir('src/timesync')
 subdir('src/tmpfiles')
@@ -2792,7 +2785,6 @@ subdir('test')
 
 #####################################################################
 
-subdir('docs/sysvinit')
 subdir('docs/var-log')
 subdir('hwdb.d')
 subdir('man')
@@ -3023,8 +3015,6 @@ summary({
         'sysconf directory'                         : sysconfdir,
         'include directory'                         : includedir,
         'lib directory'                             : libdir,
-        'SysV init scripts'                         : sysvinit_path,
-        'SysV rc?.d directories'                    : sysvrcnd_path,
         'SysV rc.local script'                      : sysvrclocal_path,
         'PAM modules directory'                     : pamlibdir,
         'PAM configuration directory'               : pamconfdir,