add fallback for external ORT without find module

cmake_files/LookUpONNXRT.cmake

@@ -1,5 +1,25 @@
 
 find_package(onnxruntime QUIET)
+
+if(${onnxruntime_FOUND} AND NOT onnxruntime_INCLUDE_DIR)
+  find_path(onnxruntime_INCLUDE_DIR NAMES onnxruntime_cxx_api.h
+      HINTS
+      ENV onnxruntime_ROOT
+      ENV onnxruntime_ROOT_DIR
+      ${CMAKE_INSTALL_PREFIX}/include
+      ${KDE4_INCLUDE_DIR}
+      PATH_SUFFIXES onnxruntime
+  )
+  include(FindPackageHandleStandardArgs)
+  find_package_handle_standard_args(onnxruntime DEFAULT_MSG onnxruntime_INCLUDE_DIR TRUE)
+  set(onnxruntime_LIBRARIES onnxruntime)
+  get_filename_component(onnxruntime_INSTALL_PREFIX "${onnxruntime_INCLUDE_DIR}/../../" ABSOLUTE)
+  find_library(onnxruntime_LIBRARY onnxruntime PATHS "${onnxruntime_INSTALL_PREFIX}/lib")
+  add_library(${onnxruntime_LIBRARIES} SHARED IMPORTED)
+  set_target_properties(${onnxruntime_LIBRARIES} PROPERTIES IMPORTED_LOCATION "${onnxruntime_LIBRARY}")
+  set_target_properties(${onnxruntime_LIBRARIES} PROPERTIES INTERFACE_INCLUDE_DIRECTORIES "${onnxruntime_INCLUDE_DIR}")
+endif()
+
 if(NOT ${onnxruntime_FOUND})
   message(STATUS "ONNXrt not found. Attempt to install...")
   EXECUTE_PROCESS( COMMAND uname -m COMMAND tr -d '\n' OUTPUT_VARIABLE ARCH )
@@ -30,9 +50,6 @@ if(NOT ${onnxruntime_FOUND})
   set(onnxruntime_LIBRARIES onnxruntime)
   add_library(${onnxruntime_LIBRARIES} SHARED IMPORTED GLOBAL)
   set_target_properties(${onnxruntime_LIBRARIES} PROPERTIES IMPORTED_LOCATION ${onnxruntime_LIBRARY_DIR}/libonnxruntime.so)
-  message(STATUS "ORT-INCDIR=${onnxruntime_INCLUDE_DIR}")
-  message(STATUS "ORT-LIBDIR=${onnxruntime_LIBRARY_DIR}")
-  message(STATUS "ORT-LIB=${onnxruntime_LIBRARIES}")
   set(onnxruntime_FOUND TRUE)
 endif()