strongswan: drop unneeded sleep patch

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

net/strongswan/patches/0902-ipsec-Patch-ipsec-script-to-work-with-musl-sleep-.-P.patch

@@ -1,21 +0,0 @@
-From d71ec4f26a1334e78a38fa44a1271c52a029e3b4 Mon Sep 17 00:00:00 2001
-From: Noel Kuntze <noel.kuntze@thermi.consulting>
-Date: Mon, 12 Jul 2021 01:31:36 +0200
-Subject: [PATCH 902/904] ipsec: Patch `ipsec` script to work with musl
- `sleep`. Patch taken verbatim from openwrt package sources.
-
----
- src/ipsec/_ipsec.in | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
---- a/src/ipsec/_ipsec.in
-+++ b/src/ipsec/_ipsec.in
-@@ -257,7 +257,7 @@ stop)
- 			loop=110
- 			while [ $loop -gt 0 ] ; do
- 				kill -0 $spid 2>/dev/null || break
--				sleep 0.1 2>/dev/null
-+				sleep 1 2>/dev/null
- 				if [ $? -ne 0 ]
- 				then
- 					sleep 1