jcore: upgrade re-flex; optimize JRunArrayIterator::ListChanged #318

Job	Run time
Build & Package Ubuntu	1h 1m 33s
Build & Package Ubuntu Release	0s
Build & Package Fedora	18m 7s
Build & Package MacOS	30m 11s
Coverage	6m 48s
Upload releases	0s
Update Homebrew Formulas	0s
Build apps (drakon)	2s
Build apps (glove)	3s
Build apps (jx-ide)	3s
Build apps (leibnitz)	3s
Build apps (ssh-askpass)	3s
Build apps (subversion_client)	3s
Build apps (system-g)	2s
	1h 56m 58s

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