The softfloat functionality is unused, not installed and incomplete.
On platforms without floating point units, the compiler provides a softfloat
implementation so there is no point in carrying this code around locally.

Originally committed as revision 9289 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8114 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 7859 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 7851 to svn://svn.ffmpeg.org/ffmpeg/trunk