YACC warnings during compiling libipfwparser

[3Hren]

I'm trying to follow the demo low-memory build and it appears out that there are many warnings during compiling the libipfwparser.

For example:

root@148b9a2d062a:/project# meson compile -C build_release
ninja: Entering directory `/project/build_release'
[5/65] Generating libfwparser/bison_fw_parser.y with a custom command
../libfwparser/fw_parser.y:13.1-39: warning: deprecated directive: ‘%define parser_class_name {fw_parser_t}’, use ‘%define api.parser.class {fw_parser_t}’ [-Wdeprecated]
   13 | %define parser_class_name {fw_parser_t}     // for bison 3.0
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      | %define api.parser.class {fw_parser_t}

... and so on.