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awk: fix %c printf format not handling runes

--- a/sys/src/cmd/awk/run.c

+++ b/sys/src/cmd/awk/run.c

@@ -840,6 +840,7 @@

 {

 	char *fmt;

 	char *p, *t, *os;

+	Rune r;

 	Cell *x;

 	int flag, n;

 	int fmtwd; /* format width */

@@ -916,6 +917,7 @@

 			flag = 4;

 			break;

 		case 'c':

+			t[-1] = 'C';

 			flag = 5;

 			break;

 		default:

@@ -963,8 +965,8 @@

 					*p = '\0';

 				}

 			} else {

-				if((*p = getsval(x)[0]) != '\0')

-					p++;

+				chartorune(&r, getsval(x));

+				p += runetochar(p, &r);

 				*p = '\0';

 			}

 			break;

-- 

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