add dmalloc

package/dmalloc/Config.in

@@ -0,0 +1,10 @@
+config BR2_PACKAGE_DMALLOC
+	bool "dmalloc"
+	default n
+	help
+	  A debug memory allocation library which is a drop in replacement for
+	  the system's malloc, realloc, calloc, free and other memory management
+	  routines while providing powerful debugging facilities configurable at
+	  runtime.
+
+	  http://dmalloc.com/