Problems with the Windows build

[John W. Eaton]

[I also posted the following information to the bug #40381 (the PATH
setting was suggested in one of the comments in that report).  --jwe]

I tried building current Octave (hg id = 8b353af4a1ca) with mxe-octave
(hg id = e7cb2340feff+; changes only in the version number and sha1sum
for the Octave tar file that I generated).

When I copy the resulting binary to my Windows 7 system and run
__run_test_suite__, it fails a number of tests, some with a message
about not finding makeinfo not recognized as an internal or external
command, operable program, or batch file. But system ("makeinfo
--version") displays the makeinfo version info as expected.

This message doesn't show up until later in the tests, so I thought
maybe we were accumulating open files or something similar that was
preventing Octave from opening program files to run. So I tried
running only the fixed tests, but that doesn't seem to avoid the
problem.

Then I tried running Octave from inside an msys terminal window after
setting PATH as suggested and it crashes with a segfault in the fsolve
test.

I'm also noticing a number of times when the GUI appears to hang and I
get a spinning cursor. It usually comes back after 5-10 (or maybe
more) seconds, but I have no idea what is going on during the delay.

Ugh, we can't release like this...

jwe