Forward link used on SF ticket system is broken
https://sourceforge.net/p/mingw/bugs/ links to https://sourceforge.net/p/mingw/https;//osdn.net/projects/mingw because the text likely used is "https;//osdn.net/projects/mingw".
Solution: Admin SF ticket system and replace the semicolon by a colon.
Thanks for the heads-up, (and the accurate diagnosis of the fault). It should be fixed now.