Support auto-configuration of both Kerberos V4 and
Kerberos V5 for movemail, including detection of V4 and V5 header files and libraries. Include <string.h> when STDC_HEADERS is defined, to get declarations of string functions. [KERBEROS5] (socket_connection): Support the current MIT Kerberos V5 API rather than the old one. [KERBEROS] (socket_connection): Change a constant name from SOCKET_ERROR to POP_SOCKET_ERROR to avoid a namespace conflict with a constant in a header file.
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