delete unused paddle_api_config.py.in

paddle/api/paddle_api_config.py.in

-PADDLE_BUILD_DIR="@CMAKE_CURRENT_BINARY_DIR@/../"
-WITH_GPU="@WITH_GPU@"
-PROTOBUF_LIBRARY="@PROTOBUF_LIBRARY@"
-ZLIB_LIBRARIES="@ZLIB_LIBRARIES@"
-CMAKE_THREAD_LIB="@CMAKE_THREAD_LIBS_INIT@"
-CMAKE_DL_LIBS="@CMAKE_DL_LIBS@"
-
-
-WITH_PYTHON="@WITH_PYTHON@"
-PYTHON_LIBRARIES="@PYTHON_LIBRARIES@"
-GLOG_LIBRARIES="@GLOG_LIBRARIES@"
-GFLAGS_LIBRARIES="@GFLAGS_LIBRARIES@"
-GFLAGS_LOCATION="@GFLAGS_LOCATION@"
-CBLAS_LIBRARIES="@CBLAS_LIBRARIES@"
-
-CUDA_LIBRARIES="@CUDA_CUDART_LIBRARY@"
-WITH_COVERALLS="@WITH_COVERAGE@"