oniguruma: updated to 6.7.0

New feature of version 6.7.0
NEW: hexadecimal codepoint \uHHHH
NEW: add ONIG_SYNTAX_ONIGURUMA (== ONIG_SYNTAX_DEFAULT)
Disabled \N and \O on ONIG_SYNTAX_RUBY
Reduced object size

New feature of version 6.6.1
Fix definition of \X

New feature of version 6.6.0
NEW: ASCII only mode options for character type/property (?WDSP)
NEW: Extended Grapheme Cluster boundary \y, \Y (*original)
NEW: Extended Grapheme Cluster \X
Range-clear (Absent-clear) operator restores previous range in backtrack.

New feature of version 6.5.0
NEW: \K (keep)
NEW: \R (general newline) \N (no newline)
NEW: \O (true anychar)
NEW: if-then-else syntax (?(...)...|...)
NEW: Backreference validity checker (?(xxx)) (*original)
NEW: Absent repeater (?~absent)
NEW: Absent expression (?~|absent|expr) (*original)
NEW: Absent stopper (?~|absent) (*original)

New feature of version 6.4.0
Fix fatal problem of endless repeat on Windows
NEW: call zero (call the total regexp) \g<0>
NEW: relative backref/call by positive number \k<+n>, \g<+n>

New feature of version 6.3.0
NEW: octal codepoint \o{.....}

New feature of version 6.1.2
allow word bound, word begin and word end in look-behind.
NEW option: ONIG_OPTION_CHECK_VALIDITY_OF_STRING

New feature of version 6.1
improved doc/RE
NEW API: onig_scan()

New feature of version 6.0
Update Unicode 8.0 Property/Case-folding
NEW API: onig_unicode_define_user_property()

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