arpa/inet: fix mingw compilation warning Mingw doesn't have <arpa/inet.h>, so a conditional use of the pragma was never encountered, and led to mingw's gcc issuing warnings about duplicate declarations under -Wredundant-decls. Making the #pragma unconditional (as was already done in at least fcntl.in.h) shuts up gcc. * lib/arpa_inet.in.h (system_header): Hoist to be unconditional. Reported by Matthew Bolte. Signed-off-by: Eric Blake <eblake@redhat.com>