D5250: cursors: Make build scripts more generic; build more sizes

[Roman Gilg]

subdiff added a reviewer: Plasma.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D5250

To: jamesl, #plasma
Cc: subdiff, plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, 
abetts, sebas, apol