bulletml: fix build failure due to -Wformat-security (#41387)

Some files are built with -Wno-format, which is not compatible with the
default hardening setting of -Wformat-security in Nixpkgs.

pkgs/development/libraries/bulletml/default.nix

···
     "-C src"
   ];
   nativeBuildInputs = [ bison perl ];
+  hardeningDisable = [ "format" ];
 
   installPhase = ''
     install -D -m 644 src/bulletml.d "$out"/include/d/bulletml.d