mock: +hexdump() from debug.cpp (#7789)

Author: d-a-v

tests/host/Makefile

@@ -301,6 +301,7 @@ ARDUINO_LIBS := \
 		base64.cpp \
 		LwipIntf.cpp \
 		LwipIntfCB.cpp \
+		debug.cpp \
 	) \
 	$(addprefix $(abspath ../../libraries/ESP8266WiFi/src)/,\
 		ESP8266WiFi.cpp \

tests/host/common/mock.h

@@ -99,6 +99,7 @@ uint32_t esp_get_cycle_count();
 #ifdef __cplusplus
 extern "C" {
 #endif
+#include <osapi.h>
 int ets_printf (const char* fmt, ...) __attribute__ ((format (printf, 1, 2)));
 #define os_printf_plus printf
 #define ets_vsnprintf vsnprintf