automake: add acsite.m4 to EXTRA_DIST

This file is required to successfully re-run autoreconf, which
many packaging tools will do even on a prepared distribution
archive.

Makefile.am

@@ -5,7 +5,8 @@ ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = ChangeLog COPYING LICENSE suricata.yaml.in \
              threshold.config \
              $(SURICATA_UPDATE_DIR) \
-	     lua
+	     lua \
+	     acsite.m4
 SUBDIRS = $(HTP_DIR) rust src qa rules doc contrib etc python ebpf \
           $(SURICATA_UPDATE_DIR)