Qt6 packaging: Cross-compiled package patching

During installation these need to be patched:

• qt-cmake wrappers
  • e.g. lib/cmake/Qt6/qt.toolchain.cmake
  • example:
    • if (NOT DEFINED ANDROID_SDK_ROOT)
      set(ANDROID_SDK_ROOT "<QtSDK>/android/sdk" CACHE STRING "")
      endif()
      set(QT_HOST_PATH "<QtSDK>/qt/qt5_cmake/qtbase_built_developer" CACHE PATH "" FORCE)
      set(QT_HOST_PATH_CMAKE_DIR "<QtSDK>/qt/qt5_cmake/qtbase_built_developer/lib/cmake" CACHE PATH "" FORCE)

set(__qt_chainload_toolchain_file "<QtSDK>/android/sdk/ndk/20.0.5594570/build/cmake/android.toolchain.cmake")

• qmake wrapper
  • call the actual qmake from host tools
• target_qt.conf
  • example:
    • [EffectiveSourcePaths]
      HostData=<QtSDK>/qt/qt5_cmake/qtbase
      [EffectivePaths]
      HostData=<QtSDK>/qt/qt5_cmake/qtbase_built_developer_android
      Prefix=../
      [Paths]
      Prefix=../
      HostPrefix=../../qtbase_built_developer
      HostData=../qtbase_built_developer_android
      Sysroot=
      SysrootifyPrefix=true
      TargetSpec=android-clang
      HostSpec=macx-clang