exclude interpreter's segment from data region

When an interpreter is located on the lower address (e.g. 0x0),
the text region is included in data region.
A fix to avoid this.

kernel/include/syscall.h

@@ -84,7 +84,8 @@ struct program_image_section {
 	unsigned long remote_pa;
 	unsigned long filesz, offset;
 	int prot;
-	int padding;
+	unsigned char interp;
+	unsigned char padding[3];
 	void *fp;
 };