py/emitglue: Host definition of mp_verbose_flag.

This may not seem like the ideal place, but is actually the only place
in py/ where it gets referenced, so is just right.

lib/utils/printf.c

@@ -48,8 +48,6 @@ int vprintf(const char *fmt, va_list ap) {
 }
 
 #if MICROPY_DEBUG_PRINTERS
-mp_uint_t mp_verbose_flag = 1;
-
 int DEBUG_printf(const char *fmt, ...) {
     va_list ap;
     va_start(ap, fmt);

py/emitglue.c

@@ -45,6 +45,10 @@
 #define DEBUG_OP_printf(...) (void)0
 #endif
 
+#if MICROPY_DEBUG_PRINTERS
+mp_uint_t mp_verbose_flag = 0;
+#endif
+
 struct _mp_raw_code_t {
     mp_raw_code_kind_t kind : 3;
     mp_uint_t scope_flags : 7;

unix/main.c

@@ -51,7 +51,6 @@
 // Command line options, with their defaults
 STATIC bool compile_only = false;
 STATIC uint emit_opt = MP_EMIT_OPT_NONE;
-mp_uint_t mp_verbose_flag = 0;
 
 #if MICROPY_ENABLE_GC
 // Heap size of GC heap (if enabled)