Fix FTBFS when using automake build.

This resolves issue #6.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit df04a45ee5)

kftpgrabber/configure.in.in

@@ -88,6 +88,7 @@ AC_CHECK_LIB([resolv],[gethostbyname])
 AC_CHECK_LIB([nsl],[gethostbyname])
 
 AC_HEADER_STDC
+AC_HEADER_TIME
 AC_CHECK_HEADERS([fcntl.h netdb.h netinet/in.h stdlib.h string.h sys/socket.h \
 sys/time.h termios.h unistd.h openssl/aes.h openssl/blowfish.h zlib.h \
 sys/poll.h ])