- Fix POK makefile to be able to compile IMA case studies

 * ocarina/src/backends/ocarina-backends-po_hi_c-runtime.ads
   ocarina/src/backends/ocarina-backends-pok_c-makefile.adb
   - Define symbols used by PolyORB-HI-C



git-svn-id: https://tecsw.estec.esa.int/svn/taste/trunk/ocarina@2410 129961e7-ef38-4bb5-a8f7-c9a525a55882