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I've never trusted common variables. Take those bare ints out of
latin.h and put them in latin.c with 'extern' declarations in the
header.

[originally from svn r8794]

--- a/latin.c

+++ b/latin.c

@@ -16,6 +16,10 @@

  * Solver.

  */

+#ifdef STANDALONE_SOLVER

+int solver_show_working, solver_recurse_depth;

+#endif

+

 /*

  * Function called when we are certain that a particular square has

  * a particular number in it. The y-coordinate passed in here is

--- a/latin.h

+++ b/latin.h

@@ -8,7 +8,7 @@

 /* --- Solver structures, definitions --- */

 #ifdef STANDALONE_SOLVER

-int solver_show_working, solver_recurse_depth;

+extern int solver_show_working, solver_recurse_depth;

 #endif

 struct latin_solver {