buildroot

support/scripts: sort pie charts

Make sure that the pie charts produced by 'graph-build' and 'graph-size'
targets are sorted on the size of each piece of the pie. Otherwise, making
visual analysis is difficult, as one needs to look at the legends of each
piece and do the sorting manually in their head.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
(cherry picked from commit a3f37c53d5b7ecd8ebae4b0baabb66147896302b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>