Update to rra-c-util 4.1
* Build on systems where krb5/krb5.h exists but krb5.h does not. * Kerberos probes no longer assume transitive library dependencies. * Fix removal of /usr/include from Kerberos CPPFLAGS. * Include strings.h where present for more POSIX string functions. * Avoid passing a NULL context to krb5_get_error_message. * Fix a data type issue in the messages utility library. * Fix incorrect __attribute notations in the utility library. * Add replacement for a missing strndup (such as on Mac OS X). * Add notices to all files copied from rra-c-util.
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