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Do not depend on YACC
https://github.com/nesbox/TIC-80/pull/1726#issuecomment-989728667: > mruby can be built without yacc(or GNU Bison) after mruby 2.1.2+( https://mruby.org/releases/2020/08/06/mruby-2.1.2-released.html).
···231231################################
232232233233find_program(RAKE rake)
234234-find_program(YACC yacc)
235234if(NOT RAKE)
236236- message(FATAL_ERROR "Program `rake' not found! Ruby and `rake' are required to build mruby support.")
237237-endif()
238238-if(NOT YACC)
239239- message(FATAL_ERROR "Program `yacc' not found! Either `yacc' or GNU Bison is required to build mruby support.")
235235+ message(FATAL_ERROR "Program `rake' not found! Ruby \"rake\" is required to build mruby support.")
240236endif()
241237242238set(MRUBY_DIR ${THIRDPARTY_DIR}/mruby)