assume that runes are format (but not flags).  this allows
a format of Γ to yield this warning:

	8c -FTVw vmx.c
	warning: vmx.c:2845 format mismatch 13Γ VLONG, arg 4

rather than the somewhat obtuse

	warning: vmx.c:2845 format mismatch 13 VLONG, arg 4

for the format "%13Γ".

Reference: /n/sources/patch/applied/ccchkrune
Date: Sat Feb 20 07:52:40 CET 2010
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/cc/dpchk.c	Sat Feb 20 07:49:49 2010
+++ /sys/src/cmd/cc/dpchk.c	Sat Feb 20 07:49:48 2010
@@ -75,9 +75,9 @@
 	nstar = 0;
 	for(;;) {
 		s += chartorune(&c, s);
+		fmt += runetochar(fmt, &c);
 		if(c == 0 || c >= nelem(flagbits))
 			break;
-		fmt += runetochar(fmt, &c);
 		f = flagbits[c];
 		switch(f) {
 		case Fnone: