BUILD/MINOR: make: remove GOOS env var from go build

We want to keep our Makefile platform related so the GOOS gets
picked up based on the platform you are running it. In case you
need to manipulate the GOOS, you can still do it by using
GOOS="linux" make build. We don't want to default to linux.

Author: mjuraga

Makefile

@@ -8,7 +8,6 @@ GIT_MODIFIED2=$(shell git diff --quiet || echo .dirty)
 GIT_MODIFIED=${GIT_MODIFIED1}${GIT_MODIFIED2}
 BUILD_DATE=$(shell date -u '+%Y-%m-%dT%H:%M:%SZ')
 CGO_ENABLED?=0
-GOOS?=linux
 
 all: update clean build
 
@@ -21,7 +20,7 @@ clean:
 .PHONY: build
 build:
 	mkdir -p ${DATAPLANEAPI_PATH}/build
-	GOOS=$(GOOS) CGO_ENABLED=$(CGO_ENABLED) go build -trimpath -ldflags "-X \"main.GitRepo=${GIT_REPO}\" -X main.GitTag=${GIT_LAST_TAG} -X main.GitCommit=${GIT_HEAD_COMMIT} -X main.GitDirty=${GIT_MODIFIED} -X main.BuildTime=${BUILD_DATE}" -o ${DATAPLANEAPI_PATH}/build/dataplaneapi ${DATAPLANEAPI_PATH}/cmd/dataplaneapi/
+	CGO_ENABLED=$(CGO_ENABLED) go build -trimpath -ldflags "-X \"main.GitRepo=${GIT_REPO}\" -X main.GitTag=${GIT_LAST_TAG} -X main.GitCommit=${GIT_HEAD_COMMIT} -X main.GitDirty=${GIT_MODIFIED} -X main.BuildTime=${BUILD_DATE}" -o ${DATAPLANEAPI_PATH}/build/dataplaneapi ${DATAPLANEAPI_PATH}/cmd/dataplaneapi/
 
 .PHONY: e2e
 e2e: build