package/openrc/sysv-rcs: fix shellcheck 0.10 warnings

* Explicitly set shell type. Shellcheck doesn't know OpenRC, but the
  script as such is POSIX shell.
* Override warnings not applicable in context.

Signed-off-by: Fiona Klute <fiona.klute@gmx.de>
Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>

package/openrc/sysv-rcs

@@ -1,5 +1,7 @@
 #!/sbin/openrc-run
+# shellcheck shell=sh
 
+# shellcheck disable=SC2034 # definition for OpenRC
 description="start or stop sysv rc[S,K] scripts"
 
 depend() {
@@ -17,6 +19,8 @@ start() {
 }
 
 stop() {
+    # we need to reverse the order here, sort -r would be no less fragile
+    # shellcheck disable=SC2045
     for i in $(ls -r /etc/init.d/S??*); do
         # Ignore dangling symlinks (if any).
         [ -e "$i" ] || continue