Generate proper header dependency graph with Jmk2
diff --git a/src/kernel/x86_32/x86_32.jmk b/src/kernel/x86_32/x86_32.jmk
index 875331c..9a67295 100644
--- a/src/kernel/x86_32/x86_32.jmk
+++ b/src/kernel/x86_32/x86_32.jmk
@@ -22,7 +22,7 @@
 	tss_flush.s \
 	idt.s \
 	log.c \
-	irq.c \
+	irq.s \
 	pic.c \
 	timer.c \
 	paging.c \