Update php56 to 5.6.30.

PHP                                                                        NEWS
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19 Jan 2017, PHP 5.6.30

- EXIF:
  . Fixed bug #73737 (FPE when parsing a tag format). (Stas)

- GD:
  . Fixed bug #73549 (Use after free when stream is passed to imagepng). (cmb)
  . Fixed bug #73868 (DOS vulnerability in gdImageCreateFromGd2Ctx()). (cmb)
  . Fixed bug #73869 (Signed Integer Overflow gd_io.c). (cmb)

- Intl:
  . Fixed bug #68447 (grapheme_extract take an extra trailing character).
    (SATŌ Kentarō)

- Phar:
  . Fixed bug #73764 (Crash while loading hostile phar archive). (Stas)
  . Fixed bug #73768 (Memory corruption when loading hostile phar). (Stas)
  . Fixed bug #73773 (Seg fault when loading hostile phar). (Stas)

- SQLite3:
  . Reverted fix for bug #73530 (Unsetting result set may reset other result
    set). (cmb)

- Standard:
  . Fixed bug #70213 (Unserialize context shared on double class lookup).
    (Taoguang Chen)
  . Fixed bug #73825 (Heap out of bounds read on unserialize in
    finish_nested_data()). (Stas)

(taca)