Attempt to build gnucash(master) via Msys2/jhbuild

[Geert Janssens]

So I revived a Windows 7 Professional 64bit PC that was collecting dust in the 
corner to become a test builder for Gnucash on Windows (master).

In the process of getting this set up and running I ran into a number of 
issues. I've duly written bug reports to track them all:
https://bugzilla.gnome.org/show_bug.cgi?id=787176
https://bugzilla.gnome.org/show_bug.cgi?id=787177
https://bugzilla.gnome.org/show_bug.cgi?id=787179
https://bugzilla.gnome.org/show_bug.cgi?id=787190
https://bugzilla.gnome.org/show_bug.cgi?id=787192

I managed to get past most of them (though they're not fixed yet), but I'm 
stuck on the last one: MSys2/Jhbuild fails to find swig in gnucash configure 
step

I'll need some help understanding why this is happening and how to get past 
it. The full output of the configure step is in the bug report.

I know John is afk so I may have to wait for his return, but I figured to 
report my effort so far.

Regards,

Geert