Log Message:
RE-flex: Update to 2.1.2

- Jun 29, 2020: 2.1.0 added Bison complete locations filename member access; \ 
added example Mini C compiler `minic` using RE/flex scanner with Bison 3.2 C++ \ 
complete locations, compiles C-like source code to Java bytecode (class files); \ 
added fast fuzzy (approximate) regex matcher `reflex::FuzzyMatcher` derived from \ 
`reflex::Matcher`.
- Jul  8, 2020: 2.1.1 added `%option params` to extend `lex()`/`yylex()` \ 
parameters; updated AVX2 detection for SIMD optimizations.
- Jul  9, 2020: 2.1.2 minor change to fix MSVC++ compiler error.