Fix compiler warnings from missing includes

src/test_sg.c

@@ -6,6 +6,8 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <scsi/sg_lib.h>
+#include <scsi/sg_pt.h>
 #include "stlink-common.h"
 
 int main(int argc, char *argv[]) {