[Pam-developers] Fixes for compiler warnings

Hi, beside the unused variable warning for pam_timestamp, gcc 4.6 complains about quite some wrong usages of "const" and "const"-castings. And strictly spoken, most of the time the compiler had right. Ok to apply the attached patch? It fixes some of the warnings, the others are hard to fix or not fixable. Thorsten -- Thorsten Kukuk, Project Manager/Release Manager SLES SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)