Fix Windows ZTS shared-build LNK2001 on _tsrm_ls_cache

[jahnvi480]

Problem

Windows thread-safe (ZTS) shared builds fail to link:

core_stmt.obj : error LNK2001: unresolved external symbol
"void * _tsrm_ls_cache" (?_tsrm_ls_cache@@3PEAXEA)
fatal error LNK1120: 1 unresolved externals

NTS builds and all Linux/macOS builds are unaffected.

Root cause

A C vs C++ language-linkage mismatch on _tsrm_ls_cache, exposed only when
ZEND_ENABLE_STATIC_TSRMLS_CACHE is defined (config.w32 defines it; config.m4 does not):

• init.cpp / pdo_init.cpp include php_*sqlsrv.h (-> php.h -> zend.h) inside
  an extern "C" block, so zend.h's file-scope ZEND_TSRMLS_CACHE_EXTERN() gives
  _tsrm_ls_cache C linkage, and ZEND_TSRMLS_CACHE_DEFINE() defines the unmangled symbol.
• shared/core_sqlsrv.h includes php.h outside extern "C", so core_stmt.cpp
  (via SQLSRV_G -> ZEND_MODULE_GLOBALS_ACCESSOR -> TSRMG_STATIC -> _tsrm_ls_cache)
  references the C++-mangled ?_tsrm_ls_cache@@3PEAXEA.
• Definition (C, unmangled) != reference (C++, mangled) -> LNK2001.

The define is applied consistently to every sqlsrv/pdo_sqlsrv translation unit, so the
failure is a linkage mismatch rather than a missing define. Merely relocating the define
within config.w32 is a no-op; removing it is what changes the outcome.

Fix

Remove /DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 from both EXTENSION() calls. The Windows
shared build then resolves the TSRM cache through the engine (tsrm_get_ls_cache()),
matching the Linux/macOS config.m4 builds and the Windows static build.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.80%. Comparing base (c0edf0c) to head (39317c0).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1674   +/-   ##
=======================================
  Coverage   85.80%   85.80%           
=======================================
  Files          23       23           
  Lines        7247     7247           
=======================================
  Hits         6218     6218           
  Misses       1029     1029           

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