!3188 cmake bug fix

Merge pull request !3188 from liubuyu/dev

cmake/package_script.cmake

 # find exec
 find_package(Python3 3.7 COMPONENTS Interpreter Development)
 if (NOT Python3_FOUND)
-    message("No python3 found.")
-    return ()
+    message(FATAL_ERROR "No python3 found.")
 endif ()
 
 set(PYTHON ${Python3_EXECUTABLE})
 set(PYTHON_VERSION ${Python3_VERSION_MAJOR}.${Python3_VERSION_MINOR})
 
+if (NOT PYTHON_VERSION MATCHES "3.7")
+    message(FATAL_ERROR "FIND PYTHON VERSION ${PYTHON_VERSION} BUT CAN NOT MATCH PYTHON VERSION 3.7")
+endif ()
+
 find_package(Git)
 if (NOT GIT_FOUND)
     message("No git found.")