fltk2: switch to build directly from svn, as that old snapshot is not available
fltk2: switch to build directly from svn, as that old snapshot is not available

* sane-srcrevs still set to svnr6671
* builds fine with svnr6921, not bumped in srcrevs as API is said to be
  unstable in 2.0 version
* Thanks blindcoder for test

Signed-off-by: Martin Jansa <516df3ff67e1fa5d153800b15fb204c0a1a389dc@gmail.com>

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