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pcc: back out -+ flag removal to allow gracefull upgrade path with new pcc but old cpp

--- a/sys/src/cmd/pcc.c

+++ b/sys/src/cmd/pcc.c

@@ -65,7 +65,7 @@

 	while(argc > 0) {

 		ARGBEGIN {

 		case '+':

-			/* No-op for compatibility */

+			append(&cpp, smprint("-%c", ARGC()));

 			break;

 		case 'c':

 			cflag = 1;