resolve CMP0074 policy warnings downstream when importing installed c…

…onduit

src/config/conduit_setup_deps.cmake

@@ -34,6 +34,12 @@ if(CONDUIT_HDF5_DIR)
     get_filename_component(HDF5_DIR_REAL "${HDF5_DIR}" REALPATH)
     message(STATUS "Looking for HDF5 at: " ${HDF5_DIR_REAL})
 
+    if(POLICY CMP0074)
+        #policy for <PackageName>_ROOT variables
+        cmake_policy(PUSH)
+        cmake_policy(SET CMP0074 NEW)
+    endif()
+
     # CMake's FindHDF5 module uses the HDF5_ROOT env var
     set(HDF5_ROOT ${HDF5_DIR_REAL})
 
@@ -57,6 +63,11 @@ if(CONDUIT_HDF5_DIR)
                            ${HDF5_DIR}/cmake)
     endif()
 
+    if(POLICY CMP0074)
+        # clear CMP0074
+        cmake_policy(POP)
+    endif()
+
     # FindHDF5/find_package sets HDF5_DIR to it's installed CMake info if it exists
     # we want to keep HDF5_DIR as the root dir of the install to be 
     # consistent with other packages