src/*.h: add mollyguards

src/font.h

@@ -1,3 +1,5 @@
+#ifndef _SMEARGLE_FONT_H
+#define _SMEARGLE_FONT_H
 
 typedef struct map_t {
 	const char *glyph;
@@ -20,3 +22,5 @@ font_t font_create(char *name, char *filename);
 void font_destroy(font_t font);
 unsigned int map_create(toml_table_t *table, map_t **map);
 void map_destroy(map_t *map);
+
+#endif

src/script.h

@@ -1,9 +1,14 @@
 
+#ifndef _SMEARGLE_SCRIPT_H
+#define _SMEARGLE_SCRIPT_H
+
 #include <stdbool.h>
 
+#include "font.h"
+
 typedef struct {
 	char *filename;
-	font_t *font;
+	font_t font;
 	char *format;
 	unsigned int min_tiles_per_line;
 	unsigned int max_tiles_per_line;
@@ -14,3 +19,5 @@ typedef struct {
 	char *tilemap_filename;
 	bool little_endian;
 } script_t;
+
+#endif

src/util.h

@@ -1,3 +1,5 @@
+#ifndef _SMEARGLE_UTIL_H
+#define _SMEARGLE_UTIL_H
 
 #include <sys/errno.h>
 #include <stdlib.h>
@@ -9,3 +11,4 @@ static void error(const char *msg, const char *msg1) {
 	exit(1);
 }
 
+#endif