Revert "another way to use backend (#636)" (#637)

This reverts commit df34b640a8.

dev_script_build_backend.py

@@ -1,45 +0,0 @@
-import os
-import shutil
-
-
-from modules.launch_util import git_clone
-
-
-def onerror(func, path, exc_info):
-    import stat
-    if not os.access(path, os.W_OK):
-        os.chmod(path, stat.S_IWUSR)
-        func(path)
-    else:
-        raise 'Failed to invoke "shutil.rmtree", git management failed.'
-
-
-def get_empty_folder(path):
-    if os.path.isdir(path) or os.path.exists(path):
-        shutil.rmtree(path, onerror=onerror)
-    os.makedirs(path, exist_ok=True)
-    return path
-
-
-comfy_repo = "https://github.com/comfyanonymous/ComfyUI"
-comfy_commit_hash = "be903eb2e2921f03a3a03dc9d6b0c6437ae201f5"
-comfy_temp_path = get_empty_folder(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'backend', 'comfy_temp'))
-comfy_core_path = get_empty_folder(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'backend', 'comfy_core'))
-
-git_clone(comfy_repo, comfy_temp_path, "ComfyUI", comfy_commit_hash)
-
-
-def get_item(name):
-    shutil.move(os.path.join(comfy_temp_path, name), os.path.join(comfy_core_path, name))
-
-
-get_item('comfy')
-get_item('comfy_extras')
-get_item('custom_nodes')
-get_item('latent_preview.py')
-get_item('folder_paths.py')
-get_item('nodes.py')
-
-shutil.rmtree(comfy_temp_path, onerror=onerror)
-
-print('Backend is built.')