Merge #11989: [build] .gitignore: add QT Creator artifacts

ac5104f [build] .gitignore: add QT Creator artifacts (Sjors Provoost)

Pull request description:

  These files appear on OSX if you follow the [QT Creator instructions](https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md#using-qt-creator-as-ide).

  The files don't contain anything terribly useful that might warrant including them in the repo instead.

Tree-SHA512: 346ece7846e7707abe599fe53b91472f7f6b79609dfdd0cb471a3363919d941385eec402045f8344f52d4d2212d29ae7c3cb2f4d55bbd978d49ac333e83f0fca

Author: laanwj

.gitignore

@@ -44,6 +44,12 @@ src/qt/forms/ui_*.h
 
 src/qt/test/moc*.cpp
 
+src/qt/bitcoin-qt.config
+src/qt/bitcoin-qt.creator
+src/qt/bitcoin-qt.creator.user
+src/qt/bitcoin-qt.files
+src/qt/bitcoin-qt.includes
+
 .deps
 .dirstamp
 .libs