Factor and simplify Makefile's and mpconfig.
diff --git a/unix/mpconfigport.h b/unix/mpconfigport.h
index 7a4622b..b790106 100644
--- a/unix/mpconfigport.h
+++ b/unix/mpconfigport.h
@@ -5,11 +5,12 @@
 #define MICROPY_USE_READLINE        (1)
 #endif
 
-#define MICROPY_ENABLE_FLOAT        (1)
-#define MICROPY_EMIT_CPYTHON        (0)
 #define MICROPY_EMIT_X64            (1)
 #define MICROPY_EMIT_THUMB          (0)
 #define MICROPY_EMIT_INLINE_THUMB   (0)
+#define MICROPY_MEM_STATS           (1)
+#define MICROPY_ENABLE_REPL_HELPERS (1)
+#define MICROPY_ENABLE_FLOAT        (1)
 
 // type definitions for the specific machine