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cpp: don't bail on all '?'

Earlier trigraph change deleted too much.

--- a/sys/src/cmd/cpp/lex.c

+++ b/sys/src/cmd/cpp/lex.c

@@ -362,6 +362,8 @@

 				}

 				state &= ~QBSBIT;

 				s->inp = ip;

+				if (c=='?')

+					goto reswitch;

 				if (c=='\\') { /* line-folding */

 					if (foldline(s)) {

 						s->lineinc++;