unistdio/*printf: Fix %n handling with module 'printf-with-n-directive'.
* m4/libunistring-base.m4 (gl_LIBUNISTRING_VERSION_CMP): Optimize the
case of VERSION = 999.9.
* modules/unistdio/u8-asnprintf (configure.ac): If module
'printf-with-n-directive' is in use, don't use an installed libunistring
for this module.
* modules/unistdio/u8-asprintf (configure.ac): Likewise.
* modules/unistdio/u8-snprintf (configure.ac): Likewise.
* modules/unistdio/u8-sprintf (configure.ac): Likewise.
* modules/unistdio/u8-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u8-vasprintf (configure.ac): Likewise.
* modules/unistdio/u8-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u8-vsprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-asnprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-asprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-snprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-sprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-vasprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u8-u8-vsprintf (configure.ac): Likewise.
* modules/unistdio/u16-asnprintf (configure.ac): Likewise.
* modules/unistdio/u16-asprintf (configure.ac): Likewise.
* modules/unistdio/u16-snprintf (configure.ac): Likewise.
* modules/unistdio/u16-sprintf (configure.ac): Likewise.
* modules/unistdio/u16-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u16-vasprintf (configure.ac): Likewise.
* modules/unistdio/u16-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u16-vsprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-asnprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-asprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-snprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-sprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-vasprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u16-u16-vsprintf (configure.ac): Likewise.
* modules/unistdio/u32-asnprintf (configure.ac): Likewise.
* modules/unistdio/u32-asprintf (configure.ac): Likewise.
* modules/unistdio/u32-snprintf (configure.ac): Likewise.
* modules/unistdio/u32-sprintf (configure.ac): Likewise.
* modules/unistdio/u32-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u32-vasprintf (configure.ac): Likewise.
* modules/unistdio/u32-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u32-vsprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-asnprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-asprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-snprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-sprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-vasnprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-vasprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-vsnprintf (configure.ac): Likewise.
* modules/unistdio/u32-u32-vsprintf (configure.ac): Likewise.
* modules/unistdio/ulc-asnprintf (configure.ac): Likewise.
* modules/unistdio/ulc-asprintf (configure.ac): Likewise.
* modules/unistdio/ulc-fprintf (configure.ac): Likewise.
* modules/unistdio/ulc-snprintf (configure.ac): Likewise.
* modules/unistdio/ulc-sprintf (configure.ac): Likewise.
* modules/unistdio/ulc-vasnprintf (configure.ac): Likewise.
* modules/unistdio/ulc-vasprintf (configure.ac): Likewise.
* modules/unistdio/ulc-vfprintf (configure.ac): Likewise.
* modules/unistdio/ulc-vsnprintf (configure.ac): Likewise.
* modules/unistdio/ulc-vsprintf (configure.ac): Likewise.