Unexport nested private classes

Nested classes follow the export specifiction of their outer class, which
isn't what was intended here.

core/polkitqt1-actiondescription.cpp

@@ -15,7 +15,7 @@
 namespace PolkitQt1
 {
 
-class ActionDescription::Data : public QSharedData
+class Q_DECL_HIDDEN ActionDescription::Data : public QSharedData
 {
 public:
     Data() {}

core/polkitqt1-authority.cpp

@@ -64,7 +64,7 @@ ActionDescription::List actionsToListAndFree(GList *glist)
     return result;
 }
 
-class Authority::Private
+class Q_DECL_HIDDEN Authority::Private
 {
 public:
     // Polkit will return NULL on failures, hence we use it instead of 0

core/polkitqt1-details.cpp

@@ -14,7 +14,7 @@
 namespace PolkitQt1
 {
 
-class Details::Data : public QSharedData
+class Q_DECL_HIDDEN Details::Data : public QSharedData
 {
 public:
     Data() {}

core/polkitqt1-identity.cpp

@@ -14,7 +14,7 @@
 namespace PolkitQt1
 {
 
-class Identity::Data : public QSharedData
+class Q_DECL_HIDDEN Identity::Data : public QSharedData
 {
 public:
     Data() : identity(nullptr) {}

core/polkitqt1-subject.cpp

@@ -15,7 +15,7 @@
 namespace PolkitQt1
 {
 
-class Subject::Data : public QSharedData
+class Q_DECL_HIDDEN Subject::Data : public QSharedData
 {
 public:
     Data()

core/polkitqt1-temporaryauthorization.cpp

@@ -13,7 +13,7 @@
 namespace PolkitQt1
 {
 
-class TemporaryAuthorization::Data : public QSharedData
+class Q_DECL_HIDDEN TemporaryAuthorization::Data : public QSharedData
 {
 public:
     Data() {}

gui/polkitqt1-gui-action.cpp

@@ -22,7 +22,7 @@ namespace Gui
 /**
   * \internal
   */
-class Action::Private
+class Q_DECL_HIDDEN Action::Private
 {
 public:
     Private(Action *p);