support for DMH_ARCHIVE in makefile

Signed-off-by: Joerg Bornkessel <hd_brummy@gentoo.org> (12 Dec 2019)
diff -Naur burn-0.2.2.orig/Makefile burn-0.2.2/Makefile
--- burn-0.2.2.orig/Makefile	2019-12-12 21:01:38.000000000 +0100
+++ burn-0.2.2/Makefile	2019-12-12 21:02:43.000000000 +0100
@@ -12,6 +12,9 @@
 
 PLUGIN = burn
 
+# Enable DMH Archive
+#ENABLE_DMH_ARCHIVE = 1
+
 ### The version number of this plugin (taken from the main source file):
 
 VERSION = $(shell grep 'const char\* plugin::VERSION *=' $(PLUGIN).c | awk '{ print $$5 }' | sed -e 's/[";]//g')