Import Geant4 10.6.0 source tree

cmake/Modules/G4EXPATShim.cmake

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+# - G4EXPATShim
+# 
+# Geant4's Geant4Config.cmake file aims to support CMake 3.8 and newer
+# The EXPAT dependency is located through CMake's builtin FindEXPAT
+# module and linked through the EXPAT::EXPAT imported target.
+# This target is however only available from CMake 3.10, so recreate
+# EXPAT::EXPAT target if it does not exist
+if(EXPAT_FOUND)
+  if(NOT TARGET EXPAT::EXPAT)
+    add_library(EXPAT::EXPAT UNKNOWN IMPORTED)
+    set_target_properties(EXPAT::EXPAT PROPERTIES
+      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+      IMPORTED_LOCATION "${EXPAT_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES "${EXPAT_INCLUDE_DIRS}")
+  endif()
+endif()