Run file(GET_RUNTIME_DEPENDENCIES) before windeployqt so the transitive
MinGW/Qt DLL closure resolves from a single path. Running windeployqt
first copied Qt6Core.dll into staging, causing "Multiple conflicting
paths" aborts. Also set CMP0207 to NEW and exclude SysWOW64.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>