Remove unneeded exports

Change-Id: I3416aaa226f7095d427a4daeed4481538c01ee5c

cpp/src/arrow/io/hdfs.h

@@ -38,7 +38,7 @@ class HdfsClient;
 class HdfsReadableFile;
 class HdfsOutputStream;
 
-struct ARROW_EXPORT HdfsPathInfo {
+struct HdfsPathInfo {
   ObjectType::type kind;
 
   std::string name;
@@ -56,9 +56,9 @@ struct ARROW_EXPORT HdfsPathInfo {
   int16_t permissions;
 };
 
-enum class ARROW_EXPORT HdfsDriver : char { LIBHDFS, LIBHDFS3 };
+enum class HdfsDriver : char { LIBHDFS, LIBHDFS3 };
 
-struct ARROW_EXPORT HdfsConnectionConfig {
+struct HdfsConnectionConfig {
   std::string host;
   int port;
   std::string user;

cpp/src/arrow/io/interfaces.h

@@ -34,11 +34,11 @@ class Status;
 
 namespace io {
 
-struct ARROW_EXPORT FileMode {
+struct FileMode {
   enum type { READ, WRITE, READWRITE };
 };
 
-struct ARROW_EXPORT ObjectType {
+struct ObjectType {
   enum type { FILE, DIRECTORY };
 };
 

cpp/src/arrow/python/numpy_convert.cc

@@ -38,7 +38,7 @@ namespace py {
 bool is_contiguous(PyObject* array) {
   if (PyArray_Check(array)) {
     return (PyArray_FLAGS(reinterpret_cast<PyArrayObject*>(array)) &
-        (NPY_ARRAY_C_CONTIGUOUS | NPY_ARRAY_F_CONTIGUOUS)) != 0;
+               (NPY_ARRAY_C_CONTIGUOUS | NPY_ARRAY_F_CONTIGUOUS)) != 0;
   } else {
     return false;
   }

cpp/src/arrow/python/numpy_convert.h

@@ -63,8 +63,8 @@ Status GetTensorType(PyObject* dtype, std::shared_ptr<DataType>* out);
 ARROW_EXPORT
 Status GetNumPyType(const DataType& type, int* type_num);
 
-ARROW_EXPORT Status
-NdarrayToTensor(MemoryPool* pool, PyObject* ao, std::shared_ptr<Tensor>* out);
+ARROW_EXPORT Status NdarrayToTensor(
+    MemoryPool* pool, PyObject* ao, std::shared_ptr<Tensor>* out);
 
 ARROW_EXPORT Status TensorToNdarray(const Tensor& tensor, PyObject* base, PyObject** out);
 

cpp/src/arrow/python/platform.h

@@ -21,8 +21,8 @@
 #ifndef ARROW_PYTHON_PLATFORM_H
 #define ARROW_PYTHON_PLATFORM_H
 
-#include <iostream>
 #include <Python.h>
+#include <iostream>
 
 // Work around C2528 error
 #if _MSC_VER >= 1900