remove redundant inline method in IsPlatformIncompatible (#5060)

Author: SimonCropp

src/Microsoft.TestPlatform.Utilities/InferRunSettingsHelper.cs

@@ -703,12 +703,7 @@ private static bool IsSettingIncompatible(Architecture sourcePlatform,
     private static bool IsPlatformIncompatible(Architecture sourcePlatform, Architecture targetPlatform)
     {
         return sourcePlatform is not Architecture.Default and not Architecture.AnyCPU
-            && (targetPlatform == Architecture.X64 && !Is64BitOperatingSystem() || sourcePlatform != targetPlatform);
-
-        static bool Is64BitOperatingSystem()
-        {
-            return Environment.Is64BitOperatingSystem;
-        }
+            && (targetPlatform == Architecture.X64 && !Environment.Is64BitOperatingSystem || sourcePlatform != targetPlatform);
     }
 
     /// <summary>