D22805: set autorcc by default

[Harald Sitter]

sitter added inline comments.

INLINE COMMENTS

> kossebau wrote in KDECMakeSettings.cmake:243
> Not sure if anyone is using cmake < 3.0 these days, but if, this will be a surprise box to them, as with some biulds things work (where cmake >= 3.0) and with some builds not.
> 
> This needs explicit mentioning in the docs, so developers know what they have to prepare for, also a mention since which ECM version one can rely on this behaviour.

This is cmakes's own behavior. <3.0 has no autorcc to begin with.

That being said the only reason I put the if there is because ECM itself is compatible with 2.8.12, so the if seemed appropriate.

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D22805

To: sitter
Cc: kossebau, apol, kde-frameworks-devel, kde-buildsystem, LeGast00n, sbergeron, bencreasy, michaelh, ngraham, bruns
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