Build thread-safe linked-list module in xpdev_mt.

src/xpdev/GNUmakefile

@@ -5,6 +5,8 @@ ifdef XP_SEM
 	MTOBJS	+=	$(MTOBJODIR)$(DIRSEP)xpsem$(OFILE)
 endif
 
+MT_CFLAGS += LINK_LIST_THREADSAFE
+
 # Executable Build Rule
 $(WRAPTEST): $(OBJODIR)/wraptest.o $(DEPS)
 	@echo Linking $@

src/xpdev/Makefile

@@ -4,6 +4,8 @@ SRC_ROOT	=	..
 #The following is necessary only when DLL-exporting wrapper functions
 #CFLAGS	=	$(CFLAGS) -DWRAPPER_EXPORTS
 
+MT_CFLAGS = $(MT_CFLAGS) -DLINK_LIST_THREADSAFE
+
 $(XPDEV_LIB_BUILD): $(OBJS)
 	@echo Creating $< ...
 	-$(QUIET)$(DELETE) $@