mod_auth_cas.so is not stripped. All you have to do is cat mod_auth_cas.so to see lot of variables..inside info.
file mod_auth_cas.so
mod_auth_cas.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped
I have tried "make install-stripped" with no luck. Have you guys noticed this?