chore(makefile): Remove `NETGO` check after building loki binaries. (#6856)

Encountered after upgrade to go1.19 in local breaks this assumption. Meaning, even if your loki binary built with `-tags netgo` that file `cgo_stub.go` doesn't exist in the binary. And any make <binary> keep failing.

```
 \nYour go standard library was built without the 'netgo' build tag.
To fix that, run
    sudo go clean -i net
    sudo go install -tags netgo std
make: *** [Makefile:149: cmd/loki/loki] Error 1
```

But even those commands not helping. Looks like this check was added by Tom at 2018.
tbh, checking for filename inside the binary is too much internal details that is subjected to change (which is what happened here I think).

NOTE: Had some internal discussions and confirmed that we don't need this check in recent Go versions anymore.

Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>

Makefile

@@ -55,15 +55,6 @@ DYN_DEBUG_GO_FLAGS := -gcflags "all=-N -l" -ldflags "$(GO_LDFLAGS)" -tags netgo
 # Docker mount flag, ignored on native docker host. see (https://docs.docker.com/docker-for-mac/osxfs-caching/#delegated)
 MOUNT_FLAGS := :delegated
 
-NETGO_CHECK = @strings $@ | grep cgo_stub\\\.go >/dev/null || { \
-       rm $@; \
-       echo "\nYour go standard library was built without the 'netgo' build tag."; \
-       echo "To fix that, run"; \
-       echo "    sudo go clean -i net"; \
-       echo "    sudo go install -tags netgo std"; \
-       false; \
-}
-
 # Protobuf files
 PROTO_DEFS := $(shell find . $(DONT_FIND) -type f -name '*.proto' -print)
 PROTO_GOS := $(patsubst %.proto,%.pb.go,$(PROTO_DEFS))
@@ -135,7 +126,6 @@ logcli-image:
 
 cmd/logcli/logcli:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./cmd/logcli
-	$(NETGO_CHECK)
 
 ########
 # Loki #
@@ -146,11 +136,9 @@ loki-debug: cmd/loki/loki-debug
 
 cmd/loki/loki:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 cmd/loki/loki-debug:
 	CGO_ENABLED=0 go build $(DEBUG_GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 ###############
 # Loki-Canary #
@@ -160,7 +148,6 @@ loki-canary: cmd/loki-canary/loki-canary
 
 cmd/loki-canary/loki-canary:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 #################
 # Loki-QueryTee #
@@ -170,7 +157,6 @@ loki-querytee: cmd/querytee/querytee
 
 cmd/querytee/querytee:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 ############
 # Promtail #
@@ -204,11 +190,9 @@ $(PROMTAIL_GENERATED_FILE): $(PROMTAIL_UI_FILES)
 
 clients/cmd/promtail/promtail:
 	CGO_ENABLED=$(PROMTAIL_CGO) go build $(PROMTAIL_GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 clients/cmd/promtail/promtail-debug:
 	CGO_ENABLED=$(PROMTAIL_CGO) go build $(PROMTAIL_DEBUG_GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 #########
 # Mixin #
@@ -246,7 +230,6 @@ migrate: cmd/migrate/migrate
 
 cmd/migrate/migrate:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 #############
 # Releasing #
@@ -411,7 +394,6 @@ docker-driver: docker-driver-clean
 
 clients/cmd/docker-driver/docker-driver:
 	CGO_ENABLED=0 go build $(GO_FLAGS) -o $@ ./$(@D)
-	$(NETGO_CHECK)
 
 docker-driver-push: docker-driver
 	docker plugin push $(LOKI_DOCKER_DRIVER):$(PLUGIN_TAG)$(PLUGIN_ARCH)