delete option for building doc_cn, all docs controlled by WITH_DOC

ISSUE=4587443


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1412 1ad973e4-5ce8-4261-8a94-b56d1f490c56

CMakeLists.txt

@@ -36,7 +36,6 @@ option(WITH_GFLAGS "Compile PaddlePaddle use gflags, otherwise use a flag implem
 option(WITH_TIMER "Compile PaddlePaddle use timer" OFF)
 option(WITH_TESTING "Compile and run unittest for PaddlePaddle" ${GTEST_FOUND})
 option(WITH_DOC "Compile PaddlePaddle with documentation" OFF)
-option(WITH_DOC_CN "Compile PaddlePaddle with Chinese documentation" OFF)
 option(WITH_SWIG_PY "Compile PaddlePaddle with py PaddlePaddle predict api" ${SWIG_FOUND})
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING 
@@ -150,7 +149,5 @@ add_subdirectory(paddle)
 add_subdirectory(python)
 if(WITH_DOC)
     add_subdirectory(doc)
-endif()
-if(WITH_DOC_CN)
     add_subdirectory(doc_cn)
 endif()