Log Message:
Update php-xdebug to 2.4.1.

* It support php70 but not yet php71.

Tue, Aug 02, 2016 - xdebug 2.4.1

= Fixed bugs:

- Fixed issue #1106: A thrown Exception after a class with __debugInfo gives
2 errors
- Fixed issue #1241: FAST_CALL/FAST_RET take #2
- Fixed issue #1246: Path and branch coverage should be initialised per
request, not globally
- Fixed issue #1263: Code coverage segmentation fault with opcache enabled
- Fixed issue #1277: Crash when using a userland function from RSHUTDOWN with
profiling enabled
- Fixed issue #1282: var_dump() of integers > 32 bit is broken on Windows
- Fixed issue #1288: Segfault when uncaught exception message does not
contain " in "
- Fixed issue #1291: Debugclient installation fails on Mac OS X
- Fixed issue #1326: Tracing and generators crashes with PHP 7.x
- Fixed issue #1333: Profiler accesses memory structures after freeing