[Releasing] Updating the mingw version for 5.4 (CI/packaging)

[Massimo Belgrano]

Koehne Kai <Kai.Koehne at ...> writes:
> 
> Because it's not supported by gcc for 32 bit. We've the choice between 
dwarf and sjlj. We first tried SJLJ (in
> 5.0.x releases) because it also works with native Windows stack frames 
in the exception unwind stack, but
> that was carrying such a big overhead that we switched to dwarf in later 
releases.
> 

Personally, I'm most interested in the x86 build with SEH exceptions 

afaik follow link is 4.9.1 with seh

http://sourceforge.net/projects/mingw-
w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-
builds/4.9.1/threads-win32/seh/