devel/mico: Deprecate; fix build with Clang 6

uni_fromuni.cc:56:3: error: constant expression evaluates to 240 which cannot be narrowed to type 'char' [-Wc++11-narrowing]

0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,  /* 0x30-0x37 ( 48- 55) */
^~~~

http://beefy12.nyi.freebsd.org/data/head-amd64-default/p475478_s336801/logs/errors/mico-2.3.13_3.log

yacc.yy:1798:34: error: reference to 'string_literals' is ambiguous

yyval.node = new ParseNode( string_literals, yyvsp[0].node );
                            ^

./parsenode.h:124:3: note: candidate found by name lookup is 'string_literals'

string_literals,
^

/usr/include/c++/v1/string:4043:20: note: candidate found by name lookup is

    'std::__1::literals::string_literals'
inline namespace string_literals
                 ^

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