[#2622] [#2623] Compile jansson in PIC mode.
[#2622] [#2623] Compile jansson in PIC mode.

This enables building shared object libraries linked against libRodsAPI.a
(which depends on boost and jansson).

Fixes #2622

PaulVanSchayck/irods,janiheikkinen/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods