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[cc1] Avoid recovery in elseclause

We do not want to recover in any cpp function, because we are out
of synchronization at that moment.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -652,8 +652,10 @@

 {

 	int status;

-	if (cppctx == 0)

-		error("#else without #ifdef/ifndef");

+	if (cppctx == 0) {

+		cpperror("#else without #ifdef/ifndef");

+		return;

+	}

 	status = (ifstatus[cppctx-1] ^= 1);

 	cppoff += (status) ? -1 : 1;