Discard these changes base the discussion on github

discussion thread is here https://github.com/kubesphere/kubesphere/pull/3163#discussion_r533959311

Signed-off-by: rick <rick@jenkins-zh.cn>

hack/gobuild.sh

@@ -41,12 +41,6 @@ BUILD_GOARCH=${GOARCH:-$(go env GOARCH)}
 GOBINARY=${GOBINARY:-go}
 LDFLAGS=$(kube::version::ldflags)
 
-# we need to build a particular binary instead of default one in some cases
-KS_BUILD_GOOS=${KS_BUILD_GOOS:-""}
-if [[ "${KS_BUILD_GOOS}" != "" ]]; then
-  BUILD_GOOS=${KS_BUILD_GOOS}
-fi
-
 # forgoing -i (incremental build) because it will be deprecated by tool chain.
 time GOOS=${BUILD_GOOS} CGO_ENABLED=0 GOARCH=${BUILD_GOARCH} ${GOBINARY} build \
         -ldflags="${LDFLAGS}" \