restore setinclude to lexbody (there's another copy in the cc directory, too).
vc doesn't link right now with out this.  too bad.

Reference: /n/atom/patch/applied2013/setincluderest
Date: Wed Jul 31 18:06:52 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/cmd/cc/lexbody	Wed Jul 31 18:06:16 2013
+++ /sys/src/cmd/cc/lexbody	Wed Jul 31 18:06:17 2013
@@ -77,6 +77,24 @@
 }
 
 void
+setinclude(char *p)
+{
+	int i;
+
+	if(p == 0)
+		return;
+	for(i=1; i < ninclude; i++)
+		if(strcmp(p, include[i]) == 0)
+			return;
+
+	if(ninclude >= nelem(include)) {
+		yyerror("ninclude too small %d", nelem(include));
+		exits("ninclude");
+	}
+	include[ninclude++] = p;
+}
+
+void
 errorexit(void)
 {