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Emit newlines in onlycpp mode

In this mode we were printing a sequence of tokens, but
it was not very useful, because we are losing all the
information about lines. With this patch the situation
is not far better, but at least no everything is in
only one line.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -411,7 +411,7 @@

 extern int cppoff, disexpand;

 extern unsigned cppctx;

 extern Input *input;

-extern int lexmode, namespace;

+extern int lexmode, namespace, onlycpp;

 extern unsigned curctx;

 extern Symbol *curfun, *zero, *one;

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -226,6 +226,8 @@

 		goto repeat;

 	}

+	if (onlycpp)

+		putchar('\n');

 	input->begin = input->p;

 	return 1;

 }

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -13,7 +13,7 @@

 jmp_buf recover;

 static char *output;

-static int onlycpp;

+int onlycpp;

 static void

 clean(void)