When Windows programs called MSYS2/Cygwin programs argv[] handling
was something of a mess. It's still a bit of a mess, but at least
it works for the more common use-cases [*].
Mainly, if globify () detected an argument that looked like a dos
path ('C:', '"C:' or \\) then it wouldn't handle proceeding literal,
escaped quotes correctly (the " got dumped, while the \ remained).
Also, strace was setting env. var MSYS="noglob" and I can't figure
out why. This made investigating the globify () problem a lot more
difficult than it should've been.
Finally, build_argv conflated winshell with (winshell && allow_glob)
when they should be orthogonal.
Also added a bunch of debug_printf () calls.
[*] It's possible that I broke the corner-case of:
'"C:\some\quoted\\"folder with spaces\"\may\not\work"'
.. in order to support:
"C:/some/quoted/\"folder with spaces\"/now/does/work"'
.. so I might revisit this soon.
