qapi: ignore generated event files

Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/.gitignore b/.gitignore
index c658613..2286d0a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,7 @@
 /qapi-generated
 /qapi-types.[ch]
 /qapi-visit.[ch]
+/qapi-event.[ch]
 /qmp-commands.h
 /qmp-marshal.c
 /qemu-doc.html