Removed unused class.

src/ImageSharp/Common/Helpers/RuntimeEnvironment.cs

@@ -1,32 +0,0 @@
-// Copyright (c) Six Labors.
-// Licensed under the Six Labors Split License.
-
-using System;
-using System.Runtime.InteropServices;
-
-namespace SixLabors.ImageSharp
-{
-    /// <summary>
-    /// Provides information about the .NET runtime installation.
-    /// Many methods defer to <see cref="RuntimeInformation"/> when available.
-    /// </summary>
-    internal static class RuntimeEnvironment
-    {
-        private static readonly Lazy<bool> IsNetCoreLazy = new Lazy<bool>(() => FrameworkDescription.StartsWith(".NET Core", StringComparison.OrdinalIgnoreCase));
-
-        /// <summary>
-        /// Gets a value indicating whether the .NET installation is .NET Core 3.1 or lower.
-        /// </summary>
-        public static bool IsNetCore => IsNetCoreLazy.Value;
-
-        /// <summary>
-        /// Gets the name of the .NET installation on which an app is running.
-        /// </summary>
-        public static string FrameworkDescription => RuntimeInformation.FrameworkDescription;
-
-        /// <summary>
-        /// Indicates whether the current application is running on the specified platform.
-        /// </summary>
-        public static bool IsOSPlatform(OSPlatform osPlatform) => RuntimeInformation.IsOSPlatform(osPlatform);
-    }
-}

tests/ImageSharp.Tests/Helpers/RuntimeEnvironmentTests.cs

@@ -1,31 +0,0 @@
-// Copyright (c) Six Labors.
-// Licensed under the Six Labors Split License.
-
-using System.Runtime.InteropServices;
-using Xunit;
-
-namespace SixLabors.ImageSharp.Tests.Helpers
-{
-    public class RuntimeEnvironmentTests
-    {
-        [Fact]
-        public void CanDetectNetCore() => Assert.False(RuntimeEnvironment.IsNetCore);
-
-        [Fact]
-        public void CanDetectOSPlatform()
-        {
-            if (TestEnvironment.IsLinux)
-            {
-                Assert.True(RuntimeEnvironment.IsOSPlatform(OSPlatform.Linux));
-            }
-            else if (TestEnvironment.IsMacOS)
-            {
-                Assert.True(RuntimeEnvironment.IsOSPlatform(OSPlatform.OSX));
-            }
-            else if (TestEnvironment.IsWindows)
-            {
-                Assert.True(RuntimeEnvironment.IsOSPlatform(OSPlatform.Windows));
-            }
-        }
-    }
-}