remove unused QDBusUnixFileDescriptor::isSupported() method

Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>

src/dbus/qdbusunixfiledescriptor.cpp

@@ -96,10 +96,6 @@ QT_BEGIN_NAMESPACE
     continue to operate, so code need not have compile-time checks for the
     availability of this feature.
 
-    On non-Unix systems, QDBusUnixFileDescriptor will always report an
-    invalid state and QDBusUnixFileDescriptor::isSupported() will return
-    false.
-
     \sa QDBusConnection::ConnectionCapabilities, QDBusConnection::connectionCapabilities()
 */
 
@@ -216,23 +212,6 @@ int QDBusUnixFileDescriptor::fileDescriptor() const
     return d ? d->fd.operator int() : -1;
 }
 
-// qdoc documentation is generated on Unix
-
-/*!
-    Returns true if Unix file descriptors are supported on this platform. In
-    other words, this function returns true if this is a Unix platform.
-
-    Note that QDBusUnixFileDescriptor continues to operate even if this
-    function returns false. The only difference is that the
-    QDBusUnixFileDescriptor objects will always be in the isValid() == false
-    state and fileDescriptor() will always return -1. The class will not
-    consume any operating system resources.
-*/
-bool QDBusUnixFileDescriptor::isSupported()
-{
-    return true;
-}
-
 /*!
     Sets the file descriptor that this QDBusUnixFileDescriptor object holds
     to a copy of \a fileDescriptor. The original file descriptor is not

src/dbus/qdbusunixfiledescriptor.h

@@ -68,8 +68,6 @@ public:
     void giveFileDescriptor(int fileDescriptor);
     int takeFileDescriptor();
 
-    static bool isSupported();
-
 #if defined(Q_COMPILER_RVALUE_REFS)
     QDBusUnixFileDescriptor(QDBusUnixFileDescriptor &&other) : d(static_cast<Data &&>(other.d))
     { }