getaddrinfo: fix gai_strerror signature

[pspp] / ChangeLog

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 2011-04-28  Eric Blake  <eblake@redhat.com>
 
+       getaddrinfo: fix gai_strerror signature
+       * m4/getaddrinfo.m4 (gl_GETADDRINFO): Detect broken signatures,
+       and work around mingw with UNICODE defined.
+       (gl_PREREQ_GETADDRINFO): Drop redundant decl check.
+       * m4/netdb_h.m4 (gl_NETDB_H_DEFAULTS): Add witness.
+       * modules/netdb (Makefile.am): Substitute it.
+       * lib/netdb.in.h (gai_strerror): Declare replacement.
+       * lib/gai_strerror.c (rpl_gai_strerror): Fix signature.
+       * doc/posix-functions/gai_strerror.texi (gai_strerror): Document
+       the fix.
+
        getsockopt: avoid compiler warning
        * lib/getsockopt.c (rpl_getsockopt): Add a cast for mingw.
        Reported by Matthias Bolte.