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Add more functions to nullfe.c

The null get_random_seed required a little care.  It's not OK for it to
return NULL and zero because NULL isn't a valid argument to memcpy()
even with a length of zero (thank you UBSan).  So we return a single
zero byte instead.

--- a/nullfe.c

+++ b/nullfe.c

@@ -9,6 +9,13 @@

 #include "puzzles.h"

 void frontend_default_colour(frontend *fe, float *output) {}

+void get_random_seed(void **randseed, int *randseedsize)

+{ char *c = snewn(1, char); *c = 0; *randseed = c; *randseedsize = 1; }

+void deactivate_timer(frontend *fe) {}

+void activate_timer(frontend *fe) {}

+drawing *drawing_new(const drawing_api *api, midend *me, void *handle)

+{ return NULL; }

+void drawing_free(drawing *dr) {}

 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,

                int align, int colour, const char *text) {}

 void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}

@@ -49,6 +56,8 @@

                                             char *title) {return NULL;}

 void preset_menu_add_preset(struct preset_menu *parent,

                             char *title, game_params *params) {}

+void document_add_puzzle(document *doc, const game *game, game_params *par,

+			 game_state *st, game_state *st2) {}

 void fatal(const char *fmt, ...)

 {