Use prettier #defines for attributes

kernel/amd64/tss.h

@@ -1,6 +1,7 @@
 #ifndef _KERNEL_AMD64_TSS_H
 #define _KERNEL_AMD64_TSS_H
 
+#include <aux/compiler.h>
 #include <libk/std.h>
 
 struct tss {
@@ -13,7 +14,7 @@ struct tss {
   uint64_t resv2;
   uint16_t resv3;
   uint16_t iopb_off;
-} __attribute__ ((packed));
+} PACKED;
 
 volatile struct tss* amd64_get_tss (void);