Yacc/Bison syntax

[SzG <sub o gero gmail com>]

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Hello,

I was missing the Yacc/Bison syntax highlighting from MC, so I created a 
patch that includes it.

As I'm new to both git and MC-devel, that's why I'm sending a simple 
patch instead of the usual ticketing-branching-pushing excersises.
I cloned tha master yesterday, committed today and created the patch 
with git format-patch.

If you happened to need Hungarian translations in MC, i might be able to 
help.

Best regards
Gergely