Build on ppc64le fails to generate correct artifacts

[seth-priya]

The build is generating Intel binaries

[user3@p006vm77 frep]$ make build
rm -rf frep ./_releases ./_build
go fmt ./...
CGO_ENABLED=0 GOOS=linux GOARCH=amd64
go build -a -installsuffix cgo -ldflags "-s -w -X 'main.BuildVersion=1.3.11' -X 'main.BuildGitBranch=heads/master' -X 'main.BuildGitRev=166' -X 'main.BuildGitCommit=e325a0c21a6db33f763aa8e1f7ea7bd65402661a' -X 'main.BuildDate=Tue, 08 Sep 2020 13:06:33 +0000'" -o _releases/frep-1.3.11-linux-amd64
[user3@p006vm77 frep]$ find . -name frep-1.3.11-linux-amd64
./_releases/frep-1.3.11-linux-amd64

[user3@p006vm77 frep]$ file ./_releases/frep-1.3.11-linux-amd64
./_releases/frep-1.3.11-linux-amd64: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped

[seth-priya]

Setting GOOS and GOARCH appropriately fixes the problem