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Remove legacy error recovery code in compound()

The error recovery must be rewritten, so this code is disturbing.

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -301,14 +301,10 @@

 void

 compound(Symbol *lbreak, Symbol *lcont, Caselist *lswitch)

 {

-	extern jmp_buf recover;

-

 	pushctx();

 	expect('{');

 	for (;;) {

-		setsafe(END_COMP);

-		setjmp(recover);

 		if (yytoken == '}')

 			break;

 		blockit(lbreak, lcont, lswitch);