patch 8.2.0296: mixing up "long long" and __int64 may cause problems

Problem:    Mixing up "long long" and __int64 may cause problems. (John
            Marriott)
Solution:   Pass varnumber_T to vim_snprintf().  Add v:numbersize.
diff --git a/src/fileio.c b/src/fileio.c
index 575efaf..e80009f 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3016,14 +3016,14 @@
 	*p++ = ' ';
     if (shortmess(SHM_LINES))
 	vim_snprintf((char *)p, IOSIZE - (p - IObuff),
-		"%ldL, %lldC", lnum, (long_long_T)nchars);
+		"%ldL, %lldC", lnum, (varnumber_T)nchars);
     else
     {
 	sprintf((char *)p, NGETTEXT("%ld line, ", "%ld lines, ", lnum), lnum);
 	p += STRLEN(p);
 	vim_snprintf((char *)p, IOSIZE - (p - IObuff),
 		NGETTEXT("%lld character", "%lld characters", nchars),
-		(long_long_T)nchars);
+		(varnumber_T)nchars);
     }
 }