Open ended matching of foot terminfo names

Initially, foot had exactly two terminfos: foot and foot-direct.

Then, these got upstreamed to ncurses, but with certain non-standard
capabilities stripped.

Foot has therefore continued to ship the original terminfo files, but
under different names.

These are _usually_ called foot-extra and foot-extra-direct, but the
end decision is the distributions’.

To handle this, match against “foot” and “foot-*”.

chafa/chafa-term-db.c

@@ -340,7 +340,7 @@ detect_capabilities (ChafaTermInfo *ti, gchar **envp)
         gfx_seqs = sixel_seqs;
     }
 
-    if (!strcmp(term, "foot") || !strcmp(term, "foot-direct"))
+    if (!strcmp (term, "foot") || !strncmp (term, "foot-", 5))
         gfx_seqs = sixel_seqs;
 
     /* rxvt 256-color really is 256 colors only */