Description of problem:
From nsswitch/wins.c:

NSS_STATUS _nss_wins_gethostbyname_r(const char *hostname, struct hostent *he,
                          char *buffer, size_t buflen, int *h_errnop);
NSS_STATUS _nss_wins_gethostbyname2_r(const char *name, int af, struct hostent *he,
                           char *buffer, size_t buflen, int *h_errnop);

These prototypes miss the int *errnop argument.

This was originally reported as a glibc bug:

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