Fixed loading of tilesets and images from tilemaps to correctly use relative paths.

include/akgl/util.h

@@ -2,6 +2,7 @@
 #define _UTIL_H_
 
 #include <akerror.h>
+#include <akgl/staticstring.h>
 
 typedef struct point {
   int x;
@@ -22,6 +23,8 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_rectangle_points(RectanglePoints *dest,
 akerr_ErrorContext AKERR_NOIGNORE *akgl_collide_point_rectangle(point *p, RectanglePoints *r, bool *collide);
 akerr_ErrorContext AKERR_NOIGNORE *akgl_collide_rectangles(SDL_FRect *r1, SDL_FRect *r2, bool *collide);
 
+akerr_ErrorContext AKERR_NOIGNORE *akgl_path_relative(char *root, char *path, akgl_String *dst);
+
 // These are REALLY slow routines that are only useful in testing harnesses
 akerr_ErrorContext AKERR_NOIGNORE *akgl_compare_sdl_surfaces(SDL_Surface *s1, SDL_Surface *s2);
 akerr_ErrorContext AKERR_NOIGNORE *akgl_render_and_compare(SDL_Texture *t1, SDL_Texture *t2, int x, int y, int w, int h, char *writeout);