jasper: autoreconf to fix rpath issue

The old version of autotools used gets confused and ends up looking in
/usr/lib for libjpeg when host == target..

Fixes http://autobuild.buildroot.net/results/307/307cac65287420252a5bb64715d9a1edd90e72fa/



Signed-off-by: Peter Korsgaard <peter@korsgaard.com>