Update runtime options.

Summary: Sync with facebook/hhvm82906a2 and facebook/hhvm6661004.
Closes #3063

Reviewed By: @fredemmott

Differential Revision: D1410400

Pulled By: @LiraNuna
add missing include in ext_stream

Summary: We need to include sys/stat.h, or we might get errors such as:
error: aggregate 'stat s' has incomplete type and cannot be defined

Fixes the OSX build.
Closes #3061

Reviewed By: @fredemmott

Differential Revision: D1410257

Pulled By: @LiraNuna
Convert ext/xsl to HNI.

Summary: Two new tests:
```zend/bad/ext/xsl/tests/bug53965.php``` failing because of missing entity loader (see https://github.com/facebook/hhvm/pull/2376)
```zend/good/ext/xsl/tests/xslt010.php``` passing, imported from php-src

Signed-off-by: Arthur Loiret <arthur.loiretens-lyon.fr>
Closes #3059

Reviewed By: @fredemmott

Differential Revision: D1410101

Pulled By: @LiraNuna
Disable flaky zend test

Summary: failed on unrelated D1413405

Reviewed By: liranuna, bsimmers, alexanderm

Differential Revision: D1414139