gitignore: Ignore various generated files

- *.log/*.trs are generated by make check
- TAGS are generated by make tags
- build-aux, config.h.in~ by autoconf
- *.sw? are temporary files create by vim
- name_from_fd wasn't ignored yet for some reason

v2: Ignore *~ as well (Daniel Vetter)

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>