D7979: Filter out warnings as error from parser's compile flags

[Guillaume Racicot]

gracicot added inline comments.

INLINE COMMENTS

> mwolff wrote in parsesession.cpp:116
> it's just overly complicated, imo. a plain remove_if + erase would achieve the same, without moving and without constructing a second container, thus probably being faster too (and less code!)

I was focused on returning a new, filtered container, instead of just changing the current one. Sorry, I'll fix it soon. Also, I just realized I take the container by const ref, so this `std::move` is completely ineffective indeed.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D7979

To: gracicot, #kdevelop, kfunk, mwolff
Cc: mwolff, brauch, kdevelop-devel, geetamc, Pilzschaf, akshaydeo, surgenight, arrowdodger
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