Revert "Merge pull request #753 from gin-gonic/bug"

This reverts commit 556287ff0856a5ad1f9a1b493c188cabeceba929, reversing
changes made to 32cab500ecc71d2975f5699c8a65c6debb29cfbe.

logger.go

@@ -8,7 +8,6 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"runtime"
 	"time"
 
 	"golang.org/x/crypto/ssh/terminal"
@@ -49,11 +48,8 @@ func Logger() HandlerFunc {
 // Example: os.Stdout, a file opened in write mode, a socket...
 func LoggerWithWriter(out io.Writer, notlogged ...string) HandlerFunc {
 	isTerm := true
-
-	if runtime.GOOS != "appengine" && runtime.GOOS != "netbsd" && runtime.GOOS != "openbsd" {
-		if outFile, ok := out.(*os.File); ok {
-			isTerm = terminal.IsTerminal(int(outFile.Fd()))
-		}
+	if outFile, ok := out.(*os.File); ok {
+		isTerm = terminal.IsTerminal(int(outFile.Fd()))
 	}
 
 	var skip map[string]struct{}