rules_go: go: link error with libmsvcrt.a when race mode enabled on Windows

Example failure: https://buildkite.com/bazel/rules-go-golang/builds/2327#145a71ba-dee2-4eb7-b7ab-ff045ded70de

Looks like tests/core/race/race_test.go is failing with (snip):

        race_test.go:269: running: bazel test --features=race //:racy_test --test_arg=-wantrace=true
        race_test.go:277: unexpected build failure: exit status 1
            stderr:
            Loading: 
            Loading: 0 packages loaded
            INFO: Build option --features has changed, discarding analysis cache.
            Analyzing: target //:racy_test (0 packages loaded, 0 targets configured)
            INFO: Analyzed target //:racy_test (0 packages loaded, 7299 targets configured).
            INFO: Found 1 test target...
            [0 / 5] [Prepa] BazelWorkspaceStatusAction stable-status.txt
            ERROR: C:/b/ksckfvdp/bazel_testing/bazel_go_test/main/BUILD.bazel:27:8: GoLink racy_test_/racy_test.exe failed (Exit 1)
            c:/tools/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/10.2.0/../../../../x86_64-w64-mingw32/lib/../lib/libmsvcrt.a(/2203): duplicate symbol reference: _unlock_file in both libgcc(.text) and libgcc(.data)
            libgcc(.text): relocation target ___chkstk_ms not defined
            libgcc(.text): relocation target atexit not defined
            link: error running the following subcommand: exit status 2

Not sure if this is due to an infra change; maybe someone more familiar with the tests can chime in?