QCursor: add move ctor

QCursor already dealt with d == nullptr, so this is trivial.

Change-Id: Ib2c6a3f0dc8b93035ffe3059cdce925463706e10
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

src/gui/kernel/qcursor.cpp

@@ -148,6 +148,16 @@ QT_BEGIN_NAMESPACE
     \sa QWidget, {fowler}{GUI Design Handbook: Cursors}
 */
 
+/*!
+    \fn QCursor::QCursor(QCursor &&other)
+    \since 5.5
+
+    Move-constructs a cursor from \a other. After being moved from,
+    the only valid operations on \a other are destruction and
+    (move and copy) assignment. The effects of calling any other
+    member function on a moved-from instance are undefined.
+*/
+
 /*!
     \fn QCursor &QCursor::operator=(QCursor &&other)
 

src/gui/kernel/qcursor.h

@@ -80,6 +80,7 @@ public:
     ~QCursor();
     QCursor &operator=(const QCursor &cursor);
 #ifdef Q_COMPILER_RVALUE_REFS
+    QCursor(QCursor &&other) Q_DECL_NOTHROW : d(other.d) { other.d = Q_NULLPTR; }
     inline QCursor &operator=(QCursor &&other)
     { qSwap(d, other.d); return *this; }
 #endif