Backport: Replace XtOffsetOf with offsetof for PHP 8.6 compatibility

[GromNaN]

Backport:

• Replace XtOffsetOf() with offsetof() for PHP 8.6 #2008

Fix PHP 8.6 build

[Copilot]

Pull request overview

Backports the upstream change from PR #2008 to maintain PHP 8.6 compatibility by replacing the removed XtOffsetOf() macro alias with the standard C offsetof() macro across the extension’s object handler setup and helper macros.

Changes:

• Replace XtOffsetOf(type, std) with offsetof(type, std) in all affected object handler initializations.
• Update the CLASS_FETCH_OBJ_DECL helper macro to compute the internal struct address using offsetof().

Reviewed changes

Copilot reviewed 34 out of 34 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/phongo_classes.h	Update internal object fetch helper macro to use offsetof()
src/MongoDB/WriteResult.c	Use offsetof() for handler offset
src/MongoDB/WriteConcern.c	Use offsetof() for handler offset
src/MongoDB/TopologyDescription.c	Use offsetof() for handler offset
src/MongoDB/Session.c	Use offsetof() for handler offset
src/MongoDB/ServerDescription.c	Use offsetof() for handler offset
src/MongoDB/ServerApi.c	Use offsetof() for handler offset
src/MongoDB/Server.c	Use offsetof() for handler offset
src/MongoDB/ReadPreference.c	Use offsetof() for handler offset
src/MongoDB/ReadConcern.c	Use offsetof() for handler offset
src/MongoDB/Query.c	Use offsetof() for handler offset
src/MongoDB/Monitoring/TopologyChangedEvent.c	Use offsetof() for handler offset
src/MongoDB/Monitoring/ServerChangedEvent.c	Use offsetof() for handler offset
src/MongoDB/Manager.c	Use offsetof() for handler offset
src/MongoDB/Cursor.c	Use offsetof() for handler offset
src/MongoDB/Command.c	Use offsetof() for handler offset
src/MongoDB/ClientEncryption.c	Use offsetof() for handler offset
src/MongoDB/BulkWriteCommandResult.c	Use offsetof() for handler offset
src/MongoDB/BulkWriteCommand.c	Use offsetof() for handler offset
src/MongoDB/BulkWrite.c	Use offsetof() for handler offset
src/BSON/Undefined.c	Use offsetof() for handler offset
src/BSON/UTCDateTime.c	Use offsetof() for handler offset
src/BSON/Timestamp.c	Use offsetof() for handler offset
src/BSON/Symbol.c	Use offsetof() for handler offset
src/BSON/Regex.c	Use offsetof() for handler offset
src/BSON/PackedArray.c	Use offsetof() for handler offset
src/BSON/ObjectId.c	Use offsetof() for handler offset
src/BSON/Javascript.c	Use offsetof() for handler offset
src/BSON/Iterator.c	Use offsetof() for handler offset
src/BSON/Int64.c	Use offsetof() for handler offset
src/BSON/Document.c	Use offsetof() for handler offset
src/BSON/Decimal128.c	Use offsetof() for handler offset
src/BSON/DBPointer.c	Use offsetof() for handler offset
src/BSON/Binary.c	Use offsetof() for handler offset

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