Adding compilation options for flex/lex and bison/yacc

Adding the options LAEX_FLAGS and YACC_FLAGS to the COMPILE_FLAGS for flex/lex bison/yacc to create more flexibility during compilation.
Example:
when one wants to compile e.g. fortranscanner.l with the flex debug flag -d one can perform the following steps:
- touch fortranscanner.l in te src directory
- run make LEX_FLAGS=-d
    or
  set environment variable LEX_FLAGS to -d
  run make

to undo this touch again forttranscanner -l and run make (don't forget to unset the environment variable LEX_FLAGS)

Analogous for bison/yacc wit the YACC_FLAGS

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