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postscript: use PI

--- a/sys/src/cmd/postscript/common/bbox.c

+++ b/sys/src/cmd/postscript/common/bbox.c

@@ -209,7 +209,7 @@

  *

  */

-    angle *= 3.1416 / 180;

+    angle *= PI / 180;

     matrix1[0] = matrix1[3] = cos(angle);

     matrix1[1] = sin(angle);