Created by: zhouwei25

fix bug of the cmake variable protobuf_MSVC_STATIC_CRT=MSVC_STATIC_CRT, It is should only be set on Windows. If on Linux, MSVC_STATIC_CRT will be empty, and set protobuf_MSVC_STATIC_RUNTIME be empty. It will effect the default value of protobuf_MSVC_STATIC_RUNTIME in CMakeLists.txt of protobuf repository. These will make PACKAGE_VERSION unsuitable. Expected:

It will result: The protobuf compiled by PaddlePaddle can not be used by other projects, that is, find_package (protobuf) will report an error:

This bug is feedback by internal RD.