ext/libxml: Fix build failure with libxml2 2.15.#22755
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Fix phpGH-22752 libxml2 2.15 removed the built-in HTTP client, the FTP module, the functions in xmlunicode.h, the shell and several other legacy symbols. The Windows export list php_libxml2.def still referenced them, so the statically linked build failed with hundreds of unresolved external symbols. Move the removed symbols into a separate php_libxml2_legacy.def and add it only when building against libxml2 < 2.15, keeping the exports intact for 2.11 through 2.14.
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Fix GH-22752
libxml2 2.15 removed the built-in HTTP client, the FTP module, the functions in xmlunicode.h, the shell and several other legacy symbols. The Windows export list php_libxml2.def still referenced them, so the statically linked build failed with hundreds of unresolved external symbols.
Move the removed symbols into a separate php_libxml2_legacy.def and add it only when building against libxml2 < 2.15, keeping the exports intact for 2.11 through 2.14.