Make profile_init() return EACCESS or EPERM if one of those errors was
encountered when failing to open any of the specified profile files.
This causes krb5_init_os_context() to fail properly when krb5.conf is
unreadable, instead of treating that situation like a nonexistent
The library will continue to soldier on if one profile file is
readable and another is not. This is deliberate as of r14116, whether
or not it's a good idea.
Commit By: ghudson