Optimize ocr system code (#209)

* Support PPYOLOE plus model

* Optimize ocr system code

* modify example code

* fix patchelf of openvino

* optimize demo code of ocr

* remove debug code

* update demo code of ocr

Co-authored-by: Jack Zhou <zhoushunjie@baidu.com>

build_scripts/patch_lib.sh

@@ -0,0 +1,15 @@
+#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+patchelf --set-rpath '${ORIGIN}' $1/*.so*