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.
7 files changed