Prepare for version 1.17. * configure.ac: Bump version number to 1.17. * include/iconv.h.in (_LIBICONV_VERSION): Likewise. * lib/Makefile.in (LIBICONV_VERSION_INFO): Bump to 9:0:7. * src/iconv.c (print_version): Update copyright year. * windows/iconv.rc: Likewise. * windows/libiconv.rc: Likewise. * README: Update download link.