configure.sh: osx: prefer local pysqlcipher over fetching remotely

the remote version seems not to work consistently; local install seems ok

an explanation is not forthcoming, but this fix apparently works

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
Merge pull request #612 from benemorius/osxfix

configure.sh: osx: prefer local pysqlcipher over fetching remotely