gdt: make gdt setup run before kmain

src/kernel.c

@@ -12,7 +12,7 @@ void kmain()
 {
 	terminal_initialize();
 	printf("KatauOS booting up\n");
-	gdt_install();
+//	gdt_install();
 	isr_install();
 	printf("Kernel init sequence completed\n");