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positional parameters: (#79488) * glib/gstrfuncs.c: * glib/gspawn-win32.c: * glib/gscanner.c: * glib/gconvert.c: * glib/gbacktrace.c: Use _g_printf wrappers. * glib/gutils.c (g_vsnprintf): Simplify, since we can assume C99 snprintf semantics now. * glib/gmessages.c (printf_string_upper_bound): No longer needed, since we can assume C99 snprintf semantics now. (g_logv): Simplify. * acinclude.m4 (AC_FUNC_PRINTF_UNIX98): New macro to check wether printf supports SUS positional parameters. * configure.in: New option --enable-included-printf to force compilation of trio; otherwise trio is compiled if the system printf misses either C99 snprintf semantics of SUS positional parameters. * glib/Makefile.am (SUBDIRS): Conditionally compile trio. (libglib_2_0_la_SOURCES): Add gprintf.c and gprintfint.h. (glibsubinclude_HEADERS): Add gprintf.h. * glib/gprintfint.h: New private wrapping either system printf or trio printf variants in _g_printf wrappers for use inside glib. * glib/gprintf.h: New public header declaring g_printf variants. * glib/gprintf.c: Corresponding implementations. * glib/trio/*: New directory, containing the trio-1.9 sources. * glib/tmpl/string_utils.sgml: Add note on including gprintf.h, move some docs inline. * glib/glib-sections.txt: Add g_printf, g_vprintf, g_fprintf, g_vfprintf, g_sprintf, g_vsprintf.