Relocate compiler #defines for PACKED, ALIGNED, SECTION.

firmware/usb_performance/usb.h

@@ -28,9 +28,6 @@
 
 #include "usb_type.h"
 
-#define ATTR_ALIGNED(x)	__attribute__ ((aligned(x)))
-#define ATTR_SECTION(x) __attribute__ ((section(x)))
-
 extern bool usb_set_configuration(
 	usb_device_t* const device,
 	const uint_fast8_t configuration_number

firmware/usb_performance/usb_type.h

@@ -25,6 +25,11 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+// TODO: Move this to some common compiler-tricks location.
+#define ATTR_PACKED __attribute__((packed))
+#define ATTR_ALIGNED(x)	__attribute__ ((aligned(x)))
+#define ATTR_SECTION(x) __attribute__ ((section(x)))
+
 typedef struct {
 	uint8_t request_type;
 	uint8_t request;