gpgscm: Move files to a gpgscm subdirectory.
Note that we used
git filter-branch --subdirectory-filter tests/gpgscm
in gnupg master to filter out the gpgscm part. This commit merely
moves these files to a subdirectory which will be used in libgpg-error
for gpgscm.
- Signed-off-by: Werner Koch <wk@gnupg.org>