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Adopt C99 bool in the grid.c API.

More or less trivially: the only affected declaration is the
has_incentre flag in struct grid_face.

--- a/grid.h

+++ b/grid.h

@@ -50,7 +50,7 @@

    * grid_find_incentre() on a face, and it will fill in ix,iy below

    * and set has_incentre to indicate that it's done so.

    */

-  int has_incentre;

+  bool has_incentre;

   int ix, iy;      /* incentre (centre of largest inscribed circle) */

 };

 struct grid_edge {