Ignore generated intermediate header files

* .gitignore: Add ioctls.h and ioctldefs.h.
diff --git a/.gitignore b/.gitignore
index 6292c94..3adf1cf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,8 +4,8 @@
 .libs
 .*.swp
 
-ChangeLog
-CREDITS
+/ChangeLog
+/CREDITS
 
 Makefile
 Makefile.in
@@ -25,5 +25,7 @@
 /stamp-h1
 
 /*.gdb
+/ioctls.h
+/ioctldefs.h
 /ioctlsort
 /strace