Fix build error by adding assert.h include

ZuluSCSI's based on the GD32F205 were failing to build because
of a missing assert.h include in src/QuirksCheck.cpp.

Added the include and the builds were successful.

src/QuirksCheck.cpp

@@ -25,6 +25,7 @@
 #include "ZuluSCSI_disk.h"
 #include "ZuluSCSI_log.h"
 #include "QuirksCheck.h"
+#include <assert.h>
 #include <stdint.h>