PHP 8.5 (compilation) support

[stancl]

Since https://github.com/php/php-src/pull/17741, dbh->error_mode is stored as uint8_t. We cast the value to pdo_error_mode for the assignment to work.

Since https://github.com/php/php-src/pull/17742, query_stmt_zval has been replaced by query_stmt_obj. The diff in the linked PR shows the new destructor usage. We follow that same usage in this commit.

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A few notes:

• I have limited experience with php-src, so please review with care. The context in the linked PRs should be sufficient.
• I did not guard the changes in pdo_dbh.cpp with PHP version checks. I assume (but do not know) that casting from pdo_error_mode to pdo_error_mode (in PHP <= 8.4) shouldn't emit any compiler warnings.
• Initially I used just (pdo_error_mode) dbh->error_mode but noticed that existing code uses static_cast. I don't have experience with C++ but assume this should be correct.

The changes are confirmed to compile for me locally, but this should be confirmed in CI.

[stancl]

@microsoft-github-policy-service agree

[Jan-E]

It compiles under Windoiws (VS17). I do not have a running sqlsrv database, so I did not run the tests.

[theoaksoft]

Hello, When will this PR be integrated? This is the only thing delaying some of us from upgrading.