Fixing *.stm32f4 builds.

src/libruntime/target/stm32f4/serializer.c

@@ -27,3 +27,10 @@ serializer_dump_data (const void *data __unused, size_t size __unused)
 }
 
 TODO (Dump memory)
+
+void
+serializer_rewrite_data (const int8_t offset, const void *data, size_t size)
+{
+  TODO (implement);
+  JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( offset, data, size);
+}

src/main.c

@@ -98,7 +98,8 @@ fake_exit (void)
 }
 
 int
-main (int argc, char **argv)
+main (int argc __unused,
+      char **argv __unused)
 {
 #ifdef __HOST
   const char *file_name = NULL;