.gitignore: Ignore libdis*, qemu-options.def

libdis, libdis-user and qemu-options.def are generated
directories / files and should be ignored by git.
Signed-off-by: NStefan Weil <weil@mail.berlios.de>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

.gitignore

@@ -6,6 +6,7 @@ config-target.*
 *-darwin-user
 *-linux-user
 *-bsd-user
+libdis*
 libhw32
 libhw64
 libuser
@@ -21,6 +22,7 @@ qemu-img
 qemu-nbd
 qemu-nbd.8
 qemu-nbd.pod
+qemu-options.def
 qemu-options.texi
 qemu-img-cmds.texi
 qemu-img-cmds.h