The krb5_copy_error_state macro wasn't used, didn't work, and didn't
need to be a macro.  Replace it with an exported API function named
krb5_copy_error_message.


https://github.com/krb5/krb5/commit/ef8186907c3d3e29260898dd484a18504ba5848e
Commit By: ghudson
Revision: 22078
Changed Files:
U   trunk/src/include/k5-int.h
U   trunk/src/include/krb5/krb5.hin
U   trunk/src/lib/krb5/krb/kerrs.c
U   trunk/src/lib/krb5/libkrb5.exports