unicode data was filtered out by pic.

Reference: /n/sources/patch/applied/pic-unicode
Date: Wed Jan  4 20:42:46 CET 2006

--- /sys/src/cmd/pic/input.c	Wed Jan  4 20:42:43 2006
+++ /sys/src/cmd/pic/input.c	Wed Jan  4 20:42:38 2006
@@ -245,7 +245,7 @@
 		printf(" <%c>", c);
 	if (ep >= ebuf + sizeof ebuf)
 		ep = ebuf;
-	return *ep++ = c;
+	return *(unsigned char *)ep++ = c;
 }
 
 nextchar(void)