* nt/mingw-cfg.site: Impede building Gnulib's vasnprintf* code.
gl_cv_func_printf_long_double=yes
gl_cv_func_printf_infinite_long_double=yes
gl_cv_func_printf_directive_a=yes
+gl_cv_func_printf_directive_b=yes
gl_cv_func_printf_directive_f=yes
gl_cv_func_printf_directive_n=yes
gl_cv_func_printf_directive_ls=yes
+gl_cv_func_printf_directive_lc=yes
gl_cv_func_printf_positions=yes
gl_cv_func_printf_flag_grouping=yes
gl_cv_func_printf_flag_leftadjust=yes