Remove unused and upstreamed patch

0004-systemd-More-lockdown.patch

@@ -1,34 +0,0 @@
-From a6963e0402695d7b6a89c1b1c75c40dbd8fcde52 Mon Sep 17 00:00:00 2001
-From: Bastien Nocera <hadess@hadess.net>
-Date: Wed, 13 Sep 2017 15:38:26 +0200
-Subject: [PATCH 4/4] systemd: More lockdown
-
-bluetoothd does not need to execute mapped memory, or real-time
-access, so block those.
----
- src/bluetooth.service.in | 6 ++++++
- 1 file changed, 6 insertions(+)
-
-diff --git a/src/bluetooth.service.in b/src/bluetooth.service.in
-index 4daedef2a..f18801866 100644
---- a/src/bluetooth.service.in
-+++ b/src/bluetooth.service.in
-@@ -22,9 +22,15 @@ ProtectControlGroups=true
- ReadWritePaths=@statedir@
- ReadOnlyPaths=@confdir@
- 
-+# Execute Mappings
-+MemoryDenyWriteExecute=true
-+
- # Privilege escalation
- NoNewPrivileges=true
- 
-+# Real-time
-+RestrictRealtime=true
-+
- [Install]
- WantedBy=bluetooth.target
- Alias=dbus-org.bluez.service
--- 
-2.21.0
-