emulation-on-host: +memcmp_P (#9093)

Author: d-a-v

tests/host/sys/pgmspace.h

@@ -82,5 +82,6 @@ inline int vsnprintf_P(char* str, size_t size, const char* format, va_list ap)
 #define strncmp_P strncmp
 #define strncasecmp_P strncasecmp
 #define strcat_P strcat
+#define memcmp_P memcmp
 
 #endif