scripts/gdb: ignore byte-compiled python files

Using the gdb scripts leaves byte-compiled python files in the scripts/
directory. These should be ignored by git.

[[e-mail]: drop redundant mrproper rule as suggested by Michal]
Signed-off-by: Daniel Thompson <[e-mail]>
Signed-off-by: Jan Kiszka <[e-mail]>
Cc: Michal Marek <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Jason Wessel <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Ben Widawsky <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

.gitignore

···
 /TAGS
 /linux
 /vmlinux
+/vmlinux-gdb.py
 /vmlinuz
 /System.map
 /Module.markers

scripts/gdb/linux/.gitignore

···
+*.pyc
+*.pyo