postfix: patch to skip setsid()

ThirdParty/postfix/Makefile

@@ -20,6 +20,7 @@ POSTFIX_TGZ_TARGET := \
 	$(P4_ROOT)/ThirdPartyBuilds/$(BUILD_PLATFORM)/postfix/postfix-$(POSTFIX_VERSION).tgz
 BDB_PATCH	:= patch -g0 -p1 < ../patches/postfix-zimbra-bdb.patch;
 NOROOT_PATCH    := patch -g0 -p1 < ../patches/noroot.patch;
+SESSION_PATCH   := patch -g0 -p1 < ../patches/session.patch;
 
 PCRE_DEF := -DHAS_PCRE
 PCRE_INCLUDE := -I$(PCRE_PREFIX)/include
@@ -50,6 +51,7 @@ build:
 	cd postfix-$(POSTFIX_VERSION); \
 	$(BDB_PATCH) \
 	$(NOROOT_PATCH) \
+	$(SESSION_PATCH) \
 	$(PATCH) \
 	patch -g0 -p1 < ../patches/postfix-main-cf-zimbra.patch; \
 	$(MAKE) $(MAKEARGS)  makefiles \

ThirdParty/postfix/patches/session.patch

+--- a/src/master/master.c
++++ b/src/master/master.c
+@@ -392,8 +392,10 @@ int     main(int argc, char **argv)
+      * all MTA processes cleanly. Give up if we can't separate from our
+      * parent process. We're not supposed to blow away the parent.
+      */
++    /*
+     if (debug_me == 0 && master_detach != 0 && setsid() == -1 && getsid(0) != getpid())
+ 	msg_fatal("unable to set session and process group ID: %m");
++    */
+ 
+     /*
+      * Make some room for plumbing with file descriptors. XXX This breaks