swig: Use %flatnested instead of %nestedworkaround

%nestedworkaround is deprecated in SWIG 3 and no longer works.

Author: robinst

ext/taglib_id3v2/relativevolumeframe.i

@@ -1,25 +1,10 @@
-%rename("bits_representing_peak") TagLib::ID3v2::PeakVolume::bitsRepresentingPeak;
-%rename("peak_volume") TagLib::ID3v2::PeakVolume::peakVolume;
+%rename("bits_representing_peak") TagLib::ID3v2::RelativeVolumeFrame::PeakVolume::bitsRepresentingPeak;
+%rename("peak_volume") TagLib::ID3v2::RelativeVolumeFrame::PeakVolume::peakVolume;
 
 %rename("set_volume_adjustment") TagLib::ID3v2::RelativeVolumeFrame::setVolumeAdjustment;
 %rename("set_volume_adjustment_index") TagLib::ID3v2::RelativeVolumeFrame::setVolumeAdjustmentIndex;
 %rename("set_peak_volume") TagLib::ID3v2::RelativeVolumeFrame::setPeakVolume;
 
-struct TagLib::ID3v2::PeakVolume {
-  unsigned char bitsRepresentingPeak;
-  TagLib::ByteVector peakVolume;
-};
-
-%nestedworkaround TagLib::ID3v2::RelativeVolumeFrame::PeakVolume;
-
-%{
-namespace TagLib {
-  namespace ID3v2 {
-    typedef RelativeVolumeFrame::PeakVolume PeakVolume;
-  }
-}
-%}
-
 %typemap(out) TagLib::List<TagLib::ID3v2::RelativeVolumeFrame::ChannelType> {
   VALUE ary = rb_ary_new2($1.size());
   for (TagLib::List<TagLib::ID3v2::RelativeVolumeFrame::ChannelType>::ConstIterator it = $1.begin();
@@ -30,6 +15,8 @@ namespace TagLib {
   $result = ary;
 }
 
+%flatnested TagLib::ID3v2::RelativeVolumeFrame::PeakVolume;
+
 %include <taglib/relativevolumeframe.h>
 
 // vim: set filetype=cpp sw=2 ts=2 expandtab: