fix on win32.

[mattn]

t\00_compile.t ........... ok
t\bad_plan.t ............. ok
t\bad_plan2.t ............ ok
t\builder_skip.t ......... ok
t\iss5.t ................. ok
t\no_test_in_subtest.t ... ok
t\prove.t ................ ok
t\prove_no_perl5opt.t .... ok
t\skip.t ................. ok
t\skip_all.t ............. ok
t\subtest_ok.t ........... ok
t\subtests_have_plan.t ... ok
t\test_requires.t ........ ok
t\typester.t ............. skipped: This test can run on utf-8 system
xt\01_podspell.t ......... skipped: Test::Spelling is not installed.
xt\02_perlcritic.t ....... ok
xt\03_pod.t .............. ok
xt\04_minimum_version.t .. skipped: META.yml could not be found
xt\05_cpan_meta.t ........ skipped: There is no META.yml
xt\06_meta_author.t ...... skipped: There is no META.yml
All tests successful.
Files=20, Tests=46, 12 wallclock secs ( 0.08 usr +  0.05 sys =  0.13 CPU)
Result: PASS