Remove the gitignore file This contained three groups entries: - autotools stuff which no longer needed - entries to ignore built artifacts, no longer needed with meson as everyting is in the builddir - special files like cscope.out, etc. These should be handled by a user in their global gitignore file since they're fairly specific to a user's setup. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>