Update to 8.30. New 16-bit character string library not enabled per default.

Release 8.30 04-February-2012
-----------------------------

Release 8.30 introduces a major new feature: support for 16-bit character
strings, compiled as a separate library. There are a few changes to the
8-bit library, in addition to some bug fixes.

. The pcre_info() function, which has been obsolete for over 10 years, has
  been removed.

. When a compiled pattern was saved to a file and later reloaded on a host
  with different endianness, PCRE used automatically to swap the bytes in some
  of the data fields. With the advent of the 16-bit library, where more of this
  swapping is needed, it is no longer done automatically. Instead, the bad
  endianness is detected and a specific error is given. The user can then call
  a new function called pcre_pattern_to_host_byte_order() (or an equivalent
  16-bit function) to do the swap.

. In UTF-8 mode, the values 0xd800 to 0xdfff are not legal Unicode
  code points and are now faulted. (They are the so-called "surrogates"
  that are reserved for coding high values in UTF-16.)

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