rustpkg test failure on windows

[klutzy]

$ make check-stage2-T-i686-pc-mingw32-H-i686-pc-mingw32-rustpkg
...

fatal runtime error: unwinding again

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
make: *** [tmp/check-stage2-T-i686-pc-mingw32-H-i686-pc-mingw32-rustpkg.ok] Error 3

Full log here. cc #10452

[klutzy]

The fatal "unwinding again" is due to #10462: some tests (e.g. test_non_numeric_tag()) use TempDir, but when the test failed, it tries to rmdir then it also got failed.

[sfackler]

rustpkg doesn't exist anymore, closing