Mimirtool fails to build on Windows

[pstibrany]

Mimirtool fails to build on Windows when running make BUILD_IN_CONTAINER=true dist

# github.com/grafana/mimir/pkg/storegateway/indexheader/fileutil
pkg/storegateway/indexheader/fileutil/mmap.go:41:12: undefined: mmap
pkg/storegateway/indexheader/fileutil/mmap.go:50:10: undefined: munmap
sha256sum: ./dist/mimirtool-windows-amd64.exe: No such file or directory
Building mimirtool for windows/arm64
# github.com/grafana/mimir/pkg/storegateway/indexheader/fileutil
pkg/storegateway/indexheader/fileutil/mmap.go:41:12: undefined: mmap
pkg/storegateway/indexheader/fileutil/mmap.go:50:10: undefined: munmap
sha256sum: ./dist/mimirtool-windows-arm64.exe: No such file or directory
make: Leaving directory '/go/src/github.com/grafana/mimir'

[pracucci]

I got the same issue on OSX, and this PR fixed it: #2054

[colega]

@pstibrany can we close this?

[pstibrany]

Yes. I was waiting for next RC and merge to main before closing.