ext/win32ole/win32ole.c (rbtime2vtdate, vtdate2rbtime): fix
the bug in conversion of milliseconds. [Bug #10258]

test/win32ole/test_win32ole_variant.rb
(test_conversion_dbl2date_with_msec,
test_conversion_time2date_with_msec): use assert_in_delta instead
of assert_equal to treat an acceptable error range.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47658 b2dd03c8-39d4-4d8f-98ff-823fe69b080e