[RISC-V] Restore IsNotQemuLinux, remove isQemu

Author: yurai007

src/libraries/Common/tests/TestUtilities/System/PlatformDetection.Unix.cs

@@ -31,7 +31,7 @@ public static partial class PlatformDetection
 
         public static bool IsMonoLinuxArm64 => IsMonoRuntime && IsLinux && IsArm64Process;
         public static bool IsNotMonoLinuxArm64 => !IsMonoLinuxArm64;
-        public static bool IsQemuLinux => IsQemu();
+        public static bool IsNotQemuLinux => !IsQemuLinux;
 
         // OSX family
         public static bool IsApplePlatform => IsOSX || IsiOS || IstvOS || IsMacCatalyst;
@@ -112,6 +112,19 @@ public static bool OpenSslPresentOnSystem
             }
         }
 
+        public static bool IsQemuLinux
+        {
+            get
+            {
+                if (IsLinux)
+                {
+                    return Environment.GetEnvironmentVariable("DOTNET_RUNNING_UNDER_QEMU") != null;
+                }
+
+                return false;
+            }
+        }
+
         private static Version s_opensslVersion;
         private static Version GetOpenSslVersion()
         {
@@ -303,15 +316,6 @@ private static bool IsDistroAndVersionOrHigher(Predicate<string> distroPredicate
             return false;
         }
 
-        private static bool IsQemu()
-        {
-            if (IsLinux)
-            {
-                return Environment.GetEnvironmentVariable("DOTNET_RUNNING_UNDER_QEMU") != null;
-            }
-            return false;
-        }
-
         private static bool VersionEquivalentTo(int major, int minor, int build, int revision, Version actualVersionId)
         {
             return (major == -1 || major == actualVersionId.Major)