Provide more helpful error when encountering older library
Provide more helpful error when encountering older library

(mjackson: fixing sense of a test to check for non-zero [-n] instead of
zero [-z] length string of the version missmatch error variable)

Change-Id: I135dd77bc6f13ba576ab199bec2203b04a807d34
Reviewed-on: http://review.couchbase.org/21177
Reviewed-by: Michael Jackson <99f87a6916722b2afede8077f5cd676395cda818@omniti.com>
Tested-by: Michael Jackson <99f87a6916722b2afede8077f5cd676395cda818@omniti.com>
Reviewed-by: Mordechai Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>
Tested-by: Mordechai Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase,couchbase/php-ext-couchbase