Remove pedantic flags from libcliopts (autotools)

Change-Id: If91b17ab4b29f981a520c6f5ae499bca824d6a29
Reviewed-on: http://review.couchbase.org/43088
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>