Add Chromium-only Blender WebEngine parity work

blender-5.2.0/build_files/windows/find_sphinx.cmd

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+REM First see if there is an environment variable set
+if EXIST "%SPHINX_BIN%" (
+    goto detect_sphinx_done
+)
+
+REM Then see if inkscape is available in the path
+for %%X in (sphinx-build.exe) do (set SPHINX_BIN=%%~$PATH:X)
+if EXIST "%SPHINX_BIN%" (
+    goto detect_sphinx_done
+)
+
+echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+echo.installed, then set the SPHINX_BIN environment variable to point
+echo.to the full path of the 'sphinx-build' executable. Alternatively you
+echo.may add the Sphinx directory to PATH.
+echo.
+echo.If you don't have Sphinx installed, grab it from
+echo.http://sphinx-doc.org/
+
+REM If still not found clear the variable
+set SPHINX_BIN=
+
+:detect_sphinx_done