patches/mstdp: drop, already in Buildroot

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

patches/mstpd/0.1.0/busybox-pidof.patch

@@ -1,26 +0,0 @@
---- mstpd-0.1.0/bridge-stp.in.orig	2022-02-04 11:49:59.764280663 +0100
-+++ mstpd-0.1.0/bridge-stp.in	2022-02-04 11:51:00.212347703 +0100
-@@ -139,7 +139,7 @@
-         fi
- 
-         # Start mstpd if necessary.
--        if ! pidof -c -s mstpd >/dev/null; then
-+        if ! pidof -s mstpd >/dev/null; then
-             if [ "$MANAGE_MSTPD" != 'y' ]; then
-                 errmsg 'mstpd is not running'
-                 exit 3
-@@ -212,12 +212,12 @@
-         done
- 
-         # Kill mstpd, since no bridges are currently using it.
--        kill $(pidof -c mstpd)
-+        kill $(pidof mstpd)
-         ;;
-     restart|restart_config)
-         if [ "$action" = 'restart' ]; then
-             # Kill mstpd.
--            pids="$(pidof -c mstpd)" ; Err=$?
-+            pids="$(pidof mstpd)" ; Err=$?
-             if [ $Err -eq 0 ]; then
-                 echo 'Stopping mstpd ...'
-                 kill $pids