add support for xchat-lua, but don't build by default

plugins/lua/makefile.mak

@@ -0,0 +1,19 @@
+include "..\..\src\makeinc.mak"
+
+xclua.dll: lua.obj lua.def
+	link $(LDFLAGS) $(LIBS) /dll /out:xclua.dll /LIBPATH:$(LUAPATH)\lib $(LUALIB).lib /def:lua.def lua.obj 
+	dir xclua.dll
+
+lua.def:
+	echo EXPORTS > lua.def
+	echo xchat_plugin_init >> lua.def
+	echo xchat_plugin_deinit >> lua.def
+
+lua.obj: lua.c makefile.mak
+	cl $(CFLAGS) /Dsnprintf=g_snprintf /I.. /I$(LUAPATH)\include /I.. lua.c
+
+clean:
+	del *.obj
+	del *.dll
+	del *.exp
+	del *.lib