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Use unreserved macro names for multiple-include protection

Some headers used macros named like _THING_H for multiple-include
protection.  That style of name is reserved in ISO C, though, so I've
replaced it with PUZZLES_THING_H which is my favourite of the other
styles in use.

--- a/loopgen.h

+++ b/loopgen.h

@@ -2,8 +2,8 @@

  * loopgen.h: interface file for loop generation functions for grid.[ch].

  */

-#ifndef _LOOPGEN_H

-#define _LOOPGEN_H

+#ifndef PUZZLES_LOOPGEN_H

+#define PUZZLES_LOOPGEN_H

 #include "puzzles.h"

 #include "grid.h"

--- a/penrose.h

+++ b/penrose.h

@@ -10,8 +10,8 @@

  * called with each tile in turn: you choose how many times to recurse.

  */

-#ifndef _PENROSE_H

-#define _PENROSE_H

+#ifndef PUZZLES_PENROSE_H

+#define PUZZLES_PENROSE_H

 #ifndef PHI

 #define PHI 1.6180339887