lxml/libiconv replacement and relink information
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RC5 uses a PyInstaller one-folder layout. The seven lxml native extension modules listed in LXML_LIBICONV_SOURCE_CORRESPONDENCE.txt are loose files under _internal/lxml and are not embedded in the application EXE or PYZ.

To make a compatible modified replacement, use the retained lxml 6.1.3 source, the retained libxml2-win-binaries 2026.05.17 build scripts/submodule pins, and the retained libiconv source commit. Build for CPython 3.12, Windows x86-64, preserving the extension module filenames and Python ABI. Replace the corresponding loose lxml native modules together as one compatible set. The proprietary application EXE does not need to be rebuilt for filesystem replacement of ABI-compatible extension modules. Functional compatibility of a modified rebuild remains the modifier's responsibility.
