Ticket #4459: usage of 'sed' in build system/makefiles is not portable.
configure: add explicit sed detection
Actually SED variable is set automatically by LT_INIT currently.
Having explicit check should help avoiding problems if/when LT_INIT
changed.
Signed-off-by: Karlson2k (Evgeny Grin) <k2k@narod.ru>
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Evgeny Grin