WIP why do we need to link to _sbrk_r?

Author: salkinium

examples/generic/usbfatfs/main.cpp

@@ -134,6 +134,13 @@ initializeFatFs()
 	f_mount(NULL, "", 1);
 }
 
+/// WHYYYY DO WE NEED THIS????
+modm_extern_c void *
+_sbrk_r(struct _reent *,  ptrdiff_t)
+{
+	return NULL;
+}
+
 // ----------------------------------------------------------------------------
 int
 main()