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Use LINESIZ instead of MAXLINE (200)

The cc1 output of libutil/unescape.c from sbase exceeds the 200
character limit (longest line is 205).

Also, make `line` static.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -10,7 +10,6 @@

 #include "cc2.h"

-#define MAXLINE     200

 #define STACKSIZ     50

 extern Type int8type, int16type, int32type, int64type,

@@ -311,7 +310,7 @@

 static int

 nextline(void)

 {

-	char line[MAXLINE];

+	static char line[LINESIZ];

 	size_t len;

 	int c;

 	void (*fun)(void);