Skip tests if extension or SAPI is not included. (#9939)

* Skip test if SAPI is not enabled.
* Skip test if simplexml extension is disabled.

[ci skip] Add xml and simplexml dependency to EXTENSIONS section in test

Prefer EXPECT over EXPECTF

Migrate SKIPIF -> EXTENSIONS (#7138)

This is an automated migration of most SKIPIF extension_loaded checks.

Bump libxml version requirement 2.7.6 => 2.9.0

Since libxml version 2.9.0 external entity loading is disabled by default.
Bumping the version requirement means that XML processing in PHP

Bump libxml version requirement 2.7.6 => 2.9.0

Since libxml version 2.9.0 external entity loading is disabled by default.
Bumping the version requirement means that XML processing in PHP is no
longer vulnerable to XXE processing attacks by default.

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