D20149: Fix compilation

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
aacid requested review of this revision.

REVISION SUMMARY
  Seems only gcc can do a constexpr with strlen.
  
  This fixes the build with clang, hopefully to with MSVC?

REPOSITORY
  R287 KImageFormats

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20149

AFFECTED FILES
  src/imageformats/kra.cpp
  src/imageformats/ora.cpp

To: aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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