Ocaml backends do not lex escape sequences in Char

[andreasabel]

unescapeInitTail is only called for String, not for `Char:

bnfc/source/src/BNFC/Backend/OCaml/CFtoOCamlLex.hs

Lines 195 to 200 in b1ecdb7

	-- strings
	, ( "'\\\"' (([^ '\\\"' '\\\\' '\\n']) | ('\\\\' ('\\\"' | '\\\\' | '\\\'' | 'n' | 't' | 'r')))* '\\\"'"
	, "TOK_String (unescapeInitTail (lexeme lexbuf))" )
	-- chars
	, ( "'\\'' (([^ '\\\'' '\\\\']) | ('\\\\' ('\\\\' | '\\\'' | 'n' | 't' | 'r'))) '\\\''"
	, "TOK_Char (lexeme lexbuf).[1]")

This causes e.g. a tab character to be lexed as backslash.