add stat_linux_mips64le.go to support for building on mips64el

[ydcool]

Signed-off-by: Dominic Yin [email protected]

Ⅰ. Describe what this PR did

add stat_linux_mips64le.go to support for building on mips64el

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

# export GOOS=linux
# export GOARCH=mips64le
# make build
Begin to build dfget, dfdaemon and supernode.
./hack/build.sh
Begin to build in the local environment.
BUILD: dfget in /src/bin/linux_mips64le/dfget
BUILD: dfdaemon in /src/bin/linux_mips64le/dfdaemon
BUILD: supernode in /src/bin/linux_mips64le/supernode

Ⅴ. Special notes for reviews