Add Android specific NetCoreVersion. (#2274)

Author: LoopedBard3

src/BenchmarkDotNet/Portability/RuntimeInformation.cs

@@ -278,21 +278,28 @@ internal static string GetRuntimeVersion()
 
         private static string GetNetCoreVersion()
         {
-            var coreclrAssemblyInfo = FileVersionInfo.GetVersionInfo(typeof(object).GetTypeInfo().Assembly.Location);
-            var corefxAssemblyInfo = FileVersionInfo.GetVersionInfo(typeof(Regex).GetTypeInfo().Assembly.Location);
-
-            if (CoreRuntime.TryGetVersion(out var version) && version >= new Version(5, 0))
+            if (IsAndroid())
             {
-                // after the merge of dotnet/corefx and dotnet/coreclr into dotnet/runtime the version should always be the same
-                Debug.Assert(coreclrAssemblyInfo.FileVersion == corefxAssemblyInfo.FileVersion);
-
-                return $".NET {version} ({coreclrAssemblyInfo.FileVersion})";
+                return $".NET {Environment.Version}";
             }
             else
             {
-                string runtimeVersion = version != default ? version.ToString() : "?";
+                var coreclrAssemblyInfo = FileVersionInfo.GetVersionInfo(typeof(object).GetTypeInfo().Assembly.Location);
+                var corefxAssemblyInfo = FileVersionInfo.GetVersionInfo(typeof(Regex).GetTypeInfo().Assembly.Location);
+
+                if (CoreRuntime.TryGetVersion(out var version) && version >= new Version(5, 0))
+                {
+                    // after the merge of dotnet/corefx and dotnet/coreclr into dotnet/runtime the version should always be the same
+                    Debug.Assert(coreclrAssemblyInfo.FileVersion == corefxAssemblyInfo.FileVersion);
 
-                return $".NET Core {runtimeVersion} (CoreCLR {coreclrAssemblyInfo.FileVersion}, CoreFX {corefxAssemblyInfo.FileVersion})";
+                    return $".NET {version} ({coreclrAssemblyInfo.FileVersion})";
+                }
+                else
+                {
+                    string runtimeVersion = version != default ? version.ToString() : "?";
+
+                    return $".NET Core {runtimeVersion} (CoreCLR {coreclrAssemblyInfo.FileVersion}, CoreFX {corefxAssemblyInfo.FileVersion})";
+                }
             }
         }