[Bug #2388] test-all 中に popen で ruby.exe が落ちる

e$B%A%1%C%He(B #2388 e$B$,99?7$5$l$^$7$?!#e(B (by Usaku NAKAMURA)

e$B;DG0$J$,$i:F8=$G$-$J$$$N$G$9$,!"$=$A$i$G$Oe(B
nmake test-all TESTS="-v ruby/test_process.rb"
[email protected]$1$G$b:F8=$G$-$^$9$+!)e(B

http://redmine.ruby-lang.org/issues/show/2388