Log Message:
Update php-xdebug to 2.5.1.

2.5.1					Sun, Feb 26, 2017 - xdebug 2.5.1

= Fixed bugs:

- Fixed issue #1057: Add xdebug.ini of all settings to package
- Fixed issue #1165: DBGp: step_out skips subsequent function calls
- Fixed issue #1180: Code coverage crashes with non-standard start/stops
- Fixed issue #1278: Xdebug with PHP 7 does not handle prefill-from-oparray
  for XDEBUG_CC_UNUSED
- Fixed issue #1300: Xdebug functions are not exposing their signature to
  Reflection
- Fixed issue #1313: Arguments to __call() trampoline picked from the wrong
  memory location
- Fixed issue #1329: While printing out a stack with and function parameters,
  XDebug reads uninitialized zvals or free()d memory
- Fixed issue #1381: Code Coverage misses line due to missing FETCH_DIM_W
  overload
- Fixed issue #1385: can not fetch IS_INDIRECT properties
- Fixed issue #1386: Executable code not shown as executed/executable
- Fixed issue #1392: Unable to compile on FreeBSD due to missing struct
  definition
- Fixed issue #1394: Code coverage does not cover instanceof (in elseif)

2.5.0					Sun, Dec 4, 2016 - xdebug 2.5.0

+ Added features:

- Implemented issue #1232: add memory delta to HTML traces
- Implemented issue #1365: Allow remote_connect_back to be set through
  XDEBUG_CONFIG

= Fixed bugs:

- Fixed issue #1168: Added defensive check to prevent infinite loop
- Fixed issue #1242: Xdebug on Windows with Eclipse has issues with
  breakpoint IDs
- Fixed issue #1343: Wrong values of numerical keys outside 32bit range
- Fixed issue #1357: Function signature using variadics is reported as being
  not executed
- Fixed issue #1361: Remote debugging connection issues with Windows (Anatol
  Belski)
- Fixed issue #1373: Crash in zend_hash_apply_with_arguments when debugging,
  due to unset symbol table

2.5.0RC1				Sat, Nov 12, 2016 - xdebug 2.5.0RC1

+ Added features:

- Implemented issue #998: Added support for IPv6 (Thomas Vanhaniemi)
- Implemented issue #1297: Initial PHP 7.1 support

= Fixed bugs:

- Fixed issue #1295: Apache crashes (SIGSEGV) when trying to establish
  connection when sockfd is large
- Fixed issue #1303: POLLRDHUP is not supported outside of Gnu/Linux
- Fixed issue #1331: Segfault in code coverage

- Removed features:

- Support for PHP versions lower than PHP 5.5 has been dropped