Yes, this means that git annex webapp on windows execs git-annex, which
execs itself to set env, and the execs itself again to redirect logs.
This is disgusting. This is Windows(TM).
That's needed in files used to build the configure program.
For the other files, I'm keeping my __WINDOWS__ define, as I find that much easier to type.
I may search and replace it to use the mingw32_HOST_OS thing later.
This cannot completely guard against a runaway log event, and only runs
every hour anyway, but it should avoid most problems with very
long-running, active assistants using up too much space.
