open https://gitlab.synchro.net/main/sbbs/-/issues/293

I want to manage the syncdraw fonts. But fontutil crash on startup

```
Starting program: /usr/local/bin/fontutil
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff7fcf700 (LWP 4087)]
[New Thread 0x7ffff7222700 (LWP 4088)]
[New Thread 0x7ffff7fbe700 (LWP 4089)]
[New Thread 0x7ffff6508700 (LWP 4093)]

Thread 3 "Blinker" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7222700 (LWP 4088)]
bitmap_draw_one_char (xpos=1, ypos=1) at bitmap_con.c:558
558 fb = this_font[fontoffset];
(gdb) bt
#0 bitmap_draw_one_char (xpos=1, ypos=1) at bitmap_con.c:558
#1 0x000055555556e7c0 in update_from_vmem (force=1) at bitmap_con.c:821
#2 0x000055555556e3f0 in blinker_thread (data=0x0) at bitmap_con.c:696
#3 0x00007ffff7d7cfa3 in start_thread (arg=<optimized out>) at pthread_create.c:486
#4 0x00007ffff7cad4cf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
```

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