um: tell git to ignore generated files

Tell git to ignore the generated files under um, except:

 include/shared/kern_constants.h
 include/shared/user_constants.h

which will be moved to include/generated.

Signed-off-by: WANG Cong <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Jeff Dike <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
2 files changed