Do not leak symbols of pimpl classes, protect with Q_DECL_HIDDEN

Nested classes inherit the visibility of their outer class,
so all the KClass::Private symbols have also been exported
if the ones of KClass were.

src/audio/kgsound-openal.cpp

@@ -25,7 +25,7 @@
 #include "kgopenalruntime_p.h"
 #include "virtualfileqt-openal.h"
 
-class KgSound::Private
+class Q_DECL_HIDDEN KgSound::Private
 {
     public:
         KgSound::PlaybackType m_type;

src/highscore/khighscore.cpp

@@ -42,7 +42,7 @@
 
 Q_LOGGING_CATEGORY(GAMES_HIGHSCORE, "org.kde.games.highscore", QtWarningMsg)
 
-class KHighscore::KHighscorePrivate
+class Q_DECL_HIDDEN KHighscore::KHighscorePrivate
 {
 public:
     KHighscorePrivate() {}

src/highscore/kscoredialog.cpp

@@ -51,7 +51,7 @@ this software.
 
 typedef QList<KScoreDialog::FieldInfo> GroupScores; ///<The list of scores in a group
 
-class KScoreDialog::KScoreDialogPrivate
+class Q_DECL_HIDDEN KScoreDialog::KScoreDialogPrivate
 {
     public:
         //QList<FieldInfo*> scores;

src/kgdifficulty.cpp

@@ -40,7 +40,7 @@
 
 //BEGIN KgDifficultyLevel
 
-class KgDifficultyLevel::Private
+class Q_DECL_HIDDEN KgDifficultyLevel::Private
 {
     public:
         bool m_isDefault;
@@ -145,7 +145,7 @@ KgDifficultyLevel::StandardLevel KgDifficultyLevel::standardLevel() const
 //END KgDifficultyLevel
 //BEGIN KgDifficulty
 
-class KgDifficulty::Private
+class Q_DECL_HIDDEN KgDifficulty::Private
 {
     public:
         QList<const KgDifficultyLevel*> m_levels;

src/kgtheme.cpp

@@ -27,7 +27,7 @@
 
 Q_LOGGING_CATEGORY(GAMES_LIB, "org.kde.games.lib", QtWarningMsg)
 
-class KgTheme::Private
+class Q_DECL_HIDDEN KgTheme::Private
 {
     public:
         const QByteArray m_identifier;

src/kgthemeprovider.cpp

@@ -27,7 +27,7 @@
 #include <KConfigGroup>
 #include <KSharedConfig>
 
-class KgThemeProvider::Private
+class Q_DECL_HIDDEN KgThemeProvider::Private
 {
     public:
         KgThemeProvider *q;

src/kgthemeselector.cpp

@@ -44,7 +44,7 @@ namespace Metrics
 
 //BEGIN KgThemeSelector
 
-class KgThemeSelector::Private
+class Q_DECL_HIDDEN KgThemeSelector::Private
 {
     public:
         KgThemeSelector* q;

src/private/kgame/kgamesequence.cpp

@@ -24,7 +24,7 @@
 #include "kplayer.h"
 #include "kgame.h"
 
-class KGameSequence::KGameSequencePrivate
+class Q_DECL_HIDDEN KGameSequence::KGameSequencePrivate
 {
   public:
     KGameSequencePrivate()