Deprecate calling FFI::cast(), FFI::new(), and FFI::type() statically

Fix GH-9139: Allow FFI in opcache.preload when opcache.preload_user=root (#9473)

Migrate i386 to GitHub actions

Closes GH-9856

Disable FFI preload tests with opcache.preload_user

Migrate skip checks to --EXTENSIONS--, p2

For rationale, see https://github.com/php/php-src/pull/6787

Make extension checks lowercase, add a special case for opcache
that has in

Migrate skip checks to --EXTENSIONS--, p2

For rationale, see https://github.com/php/php-src/pull/6787

Make extension checks lowercase, add a special case for opcache
that has internal name not matching .so filename.

Extensions migrated in part 2:
* dom
* exif
* fileinfo
* ffi

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Remove support for preloading on Windows

Due to ASLR restrictions, preloading on Windows does not work with
any code that has preloading dependencies on internal classes.
This effect

Remove support for preloading on Windows

Due to ASLR restrictions, preloading on Windows does not work with
any code that has preloading dependencies on internal classes.
This effectively makes it unusable for any non-trivial codebase.

Instead of pretending like preloading is going to work, only to
make people realize that it really doesn't once they get beyond
a dummy example, we disable support for preloading on Windows
entirely.

Closes GH-4999.

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Fix #78761: Zend memory heap corruption with preload and casting

We have to reset `FFI_G(persistent)` back to zero when preloading has
finished.