* keywords, lex.c.src, opt_insn_unif.def, opt_operand.def: moved rarely changed
  input files for code generators into defs/ directory.

* Makefile.in (lex.c): followed keywords and lex.c.src.

* common.mk (parser.o): followed keywords.
  (INSNS): followed opt_*.def

* tools/instruction.rb: followed opt_*.def.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19844 b2dd03c8-39d4-4d8f-98ff-823fe69b080e