common: Change license of ksba-io-support.c
* common/ksba-io-support.c: Change from GPLv3+ to LGPLv3+/GPLv2+.
According to the sm/ChangeLog-2011 and the git log all code has been
written by me or g10 Code employees. Also changed the copyright
notices so that the file can be sued separately.
- Signed-off-by: Werner Koch <wk@gnupg.org>