fix DEBUG macros (#5728)

* fix DEBUG macros

All fmt strings in flash
fix #5658

This also allows to avoid warnings and easy mistakes with (no brace):
    if (something)
        DEBUGV("blah");

* use newlib unaligned-compatible printf for DEBUGV

* remove useless putprintf since ::printf already uses ets_putc

libraries/ESP8266WiFi/src/ESP8266WiFi.h

@@ -50,7 +50,7 @@ extern "C" {
 #endif
 
 #ifndef DEBUG_WIFI
-#define DEBUG_WIFI(...)
+#define DEBUG_WIFI(...) do { (void)0; } while (0)
 #endif