common/types.h: Wrap #define UUID_STR_LEN 36 in #ifndef

Current Fedora 28 has the constant it in uuid/uuid.h where it belongs (per
comment next to the define), so we should treat the define as a
backward-compatibility workaround, rather than enforcing it for all.

Signed-off-by: Jan Tulak <jtulak@redhat.com>
[sandeen: tweak comment to match]
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
1 file changed