ENH: itkexpat: restore local edits after fresh import
Merge branch 'upstream-expat' into update-expat
expat 2025-09-16 (7643f96b)
ENH: itkexpat: Remove source tree to make room for fresh import
ENH: itkexpat: Add script to import from upstream
ENH: itkexpat: Update includes to reliably use ITK's expat headers
ENH: itkexpat: Update source layout to make includes ITK-specific
ENH: Integrate libLBFGS into our CMake build system