Define php_ini_scanned_files [closes #3550]

[Majkl578]

Fixes #3550 - undefined php_ini_scanned_files() function.

var_dump(php_ini_scanned_files());

Before:

$ hhvm test.php
Fatal error: Call to undefined function php_ini_scanned_files() in test.php on line 3

After:

$ hhvm test.php 
bool(false)

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[SiebelsTim]

When you stub this to always return false, you could do the implementation in php.

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[Majkl578]

@SiebelsTim: Maybe, but when I did that also for php_ini_loaded_file (which is exactly same case), it started crashing, test failure:

FAILED: test/quick/ext_options_php_ini_loaded_file.php
001+ /build/hhvm/hhvm/hphp/util/asm-x64.h:988: void HPHP::jit::X64Assembler::call(HPHP::CodeAddress): assertion `dest && jmpDeltaFits(dest)' failed.
001- bool(false)
002+ Core dumped: Aborted
003+ Aborted

[SiebelsTim]

@Majkl578 Did you remove the HHVM_FE entry?
I had rare issues where doing a clean build helped.

[Majkl578]

@SiebelsTim: Yup, removed both HHVM_FUNCTION and HHVM_FE and also __Native. I'll try clean build later (or let Travis do it :) ).

[Majkl578]

@SiebelsTim: Looks good on clean build, so amended & force-pushed, thanks for the tip.