Makefile.defs: enabled memory debugging

- to be kept for the rest of testing period to spot eventual buffer
  overflows

Makefile.defs

@@ -174,7 +174,7 @@ MEMMNG ?= 1
 # memory debugger switcher
 # 0 - off (no-debug mode)
 # 1 - on (debug mode)
-MEMDBG ?= 0
+MEMDBG ?= 1
 
 SER_VER = $(shell expr $(VERSION) \* 1000000 + $(PATCHLEVEL) \* 1000 + \
 			$(SUBLEVEL) )