ENH: CI: PKG: Fixed CMAKE_PREFIX_PATH in Packaging/Files/build_examples.cmake.

Packaging/Files/build_examples.cmake

@@ -46,6 +46,7 @@ execute_process(
   COMMAND ${CMAKE_COMMAND}
   -DCMAKE_INSTALL_PREFIX=${PKG_DIR}
   -DCMAKE_BUILD_TYPE=RelWithDebInfo
+  -DCMAKE_PREFIX_PATH=${PKG_DIR}
   ${cmake_gen}
   ${SRC_DIR}
   WORKING_DIRECTORY ${TEST_DIR}