Configure ClamdSock in a better way than patching

Makefile

@@ -22,12 +22,12 @@ all: mimedefang-service mimedefang-multiplexor-service
 	mv -v /etc/gshadow /data/etc/gshadow
 	ln -sv /data/etc/gshadow /etc/gshadow
 	tar xf mimedefang-2.84.tar.gz
-	patch -Np1 -d mimedefang-2.84 < mimedefang-2.84-clamav_socket_fix.patch
 	cd mimedefang-2.84 && ./configure --prefix=/usr
 	$(MAKE) -C mimedefang-2.84
 	$(MAKE) -C mimedefang-2.84 install
 	rm /etc/.pwd.lock
 	install -v -Dm755 mimedefang-wrapper /usr/libexec
+	install -v -Dm644 mimedefang-filter /etc/mail
 	install -v -Dm644 mimedefang.conf /etc/default/mimedefang
 	@echo "$$MIMEDEFANG_SERVICE" > /lib/systemd/system/mimedefang.service
 	@echo "$$MIMEDEFANG_MULTIPLEXOR_SERVICE" > /lib/systemd/system/mimedefang-multiplexor.service

mimedefang-2.84-clamav_socket_fix.patch

-diff -uNr mimedefang-2.84/mimedefang-filter.5.in mimedefang-2.84-clamav_socket_fix/mimedefang-filter.5.in
---- mimedefang-2.84/mimedefang-filter.5.in	2017-09-08 03:16:57.000000000 +0930
-+++ mimedefang-2.84-clamav_socket_fix/mimedefang-filter.5.in	2021-01-30 19:25:15.656463303 +1030
-@@ -634,7 +634,7 @@
- routine.
- 
- .TP
--.B $ClamdSock \fR(default @SPOOLDIR@/clamd.sock)
-+.B $ClamdSock \fR(default /run/clamav/clamd.sock)
- Socket used for clamd daemon calls within message_contains_virus_clamd
- and entity_contains_virus_clamd unless a socket is provided by the calling
- routine.
-diff -uNr mimedefang-2.84/mimedefang.pl.in mimedefang-2.84-clamav_socket_fix/mimedefang.pl.in
---- mimedefang-2.84/mimedefang.pl.in	2017-11-20 02:47:20.000000000 +1030
-+++ mimedefang-2.84-clamav_socket_fix/mimedefang.pl.in	2021-01-30 19:26:06.760624267 +1030
-@@ -171,7 +171,7 @@
- $Fprotd6Host = "127.0.0.1:10200";
- 
- $SophieSock = '@SPOOLDIR@/sophie';
--$ClamdSock  = '@SPOOLDIR@/clamd.sock';
-+$ClamdSock  = '/run/clamav/clamd.sock';
- $TrophieSock = '@SPOOLDIR@/trophie';
- 
- #***********************************************************************
-@@ -4800,7 +4800,7 @@
-     my ($entity) = shift;
-     my ($clamd_sock) = $ClamdSock;
-     $clamd_sock = shift if (@_ > 0);
--    $clamd_sock = '@SPOOLDIR@/clamd.sock' if (!defined($clamd_sock));
-+    $clamd_sock = '/run/clamav/clamd.sock' if (!defined($clamd_sock));
-     if (!defined($entity->bodyhandle)) {
- 	return (wantarray ? (0, 'ok', 'ok') : 0);
-     }
-@@ -4869,7 +4869,7 @@
- sub message_contains_virus_clamd {
-     my ($clamd_sock) = $ClamdSock;
-     $clamd_sock = shift if (@_ > 0);
--    $clamd_sock = '@SPOOLDIR@/clamd.sock' if (!defined($clamd_sock));
-+    $clamd_sock = '/run/clamav/clamd.sock' if (!defined($clamd_sock));
-     my ($output,$sock);
- 
-     # PING/PONG test to make sure clamd is alive