add STATIC for local variables

tinyusb/common/common.h

@@ -73,6 +73,12 @@
 #include "core/std_descriptors.h"
 #include "osal/osal.h"
 
+// TODO try to manipulate gcc cmd option instead
+#ifndef _TEST_
+  #define STATIC_ static
+#else
+  #define STATIC_
+#endif
 
 /// form an uint32_t from 4 x uint8_t
 static inline uint32_t u32_from_u8(uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4) ATTR_ALWAYS_INLINE ATTR_CONST;