Use prettier #defines for attributes

kernel/amd64/intr.h

@@ -1,6 +1,7 @@
 #ifndef _KERNEL_AMD64_INTR_H
 #define _KERNEL_AMD64_INTR_H
 
+#include <aux/compiler.h>
 #include <libk/std.h>
 
 struct saved_regs {
@@ -28,7 +29,7 @@ struct saved_regs {
   uint64_t rflags;
   uint64_t rsp;
   uint64_t ss;
-} __attribute__ ((packed));
+} PACKED;
 
 void amd64_intr_init (void);