D28108: Handle busybox's sed like GNU sed

[Heiko Becker]

heikobecker created this revision.
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REVISION SUMMARY
  Otherwise it uses the POSIX-style and fails with "sed: : No such file
  or directory".

TEST PLAN
  Built fine with busybox's sed

REPOSITORY
  R266 Breeze Icons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28108

AFFECTED FILES
  generate-24px-versions.sh

To: heikobecker, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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