Fix the postun script to not use ldconfig as the interpreter
    
    Don't use %postun -p /sbin/ldconfig because we want /bin/sh as the
    interpreter, not /sbin/ldconfig.
    
    /sbin/ldconfig: relative path `1' used to build cache
    warning: %postun(iscsi-initiator-utils-6.2.0.873-1.fc19.x86_64) scriptlet failed, exit status 1
    Non-fatal POSTUN scriptlet failure in rpm package iscsi-initiator-utils-6.2.0.873-1.fc19.x86_64