Clarify platform support for temp input (#4756)

plugins/inputs/temp/temp.go

@@ -2,6 +2,7 @@ package temp
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/inputs"
@@ -25,6 +26,9 @@ func (t *Temperature) SampleConfig() string {
 func (t *Temperature) Gather(acc telegraf.Accumulator) error {
 	temps, err := t.ps.Temperature()
 	if err != nil {
+		if strings.Contains(err.Error(), "not implemented yet") {
+			return fmt.Errorf("plugin is not supported on this platform: %v", err)
+		}
 		return fmt.Errorf("error getting temperatures info: %s", err)
 	}
 	for _, temp := range temps {