Fix defines to be OR_GREATER

Ix.NET/Source/System.Interactive/System/Linq/Operators/Max.cs

@@ -9,7 +9,7 @@ namespace System.Linq
     public static partial class EnumerableEx
     {
 
-#if !(REFERENCE_ASSEMBLY && (NET6_0))
+#if !(REFERENCE_ASSEMBLY && (NET6_0_OR_GREATER))
         /// <summary>
         /// Returns the maximum value in the enumerable sequence by using the specified comparer to compare values.
         /// </summary>

Ix.NET/Source/System.Interactive/System/Linq/Operators/MaxBy.cs

@@ -8,7 +8,7 @@ namespace System.Linq
 {
     public static partial class EnumerableEx
     {
-#if !(REFERENCE_ASSEMBLY && (NET6_0))
+#if !(REFERENCE_ASSEMBLY && (NET6_0_OR_GREATER))
         /// <summary>
         /// Returns the elements with the maximum key value by using the default comparer to compare key values.
         /// </summary>

Ix.NET/Source/System.Interactive/System/Linq/Operators/Min.cs

@@ -8,7 +8,7 @@ namespace System.Linq
 {
     public static partial class EnumerableEx
     {
-#if !(REFERENCE_ASSEMBLY && (NET6_0))
+#if !(REFERENCE_ASSEMBLY && (NET6_0_OR_GREATER))
         /// <summary>
         /// Returns the minimum value in the enumerable sequence by using the specified comparer to compare values.
         /// </summary>

Ix.NET/Source/System.Interactive/System/Linq/Operators/MinBy.cs

@@ -9,7 +9,7 @@ namespace System.Linq
     public static partial class EnumerableEx
     {
 
-#if !(REFERENCE_ASSEMBLY && (NET6_0))
+#if !(REFERENCE_ASSEMBLY && (NET6_0_OR_GREATER))
         /// <summary>
         /// Returns the elements with the minimum key value by using the default comparer to compare key values.
         /// </summary>

Ix.NET/Source/System.Interactive/System/Linq/Operators/SkipLast.cs

@@ -8,7 +8,7 @@ namespace System.Linq
 {
     public static partial class EnumerableEx
     {
-#if !(REFERENCE_ASSEMBLY && (NETCOREAPP2_1 || NETSTANDARD2_1))
+#if !(REFERENCE_ASSEMBLY && (NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER))
         /// <summary>
         /// Bypasses a specified number of contiguous elements from the end of the sequence and returns the remaining elements.
         /// </summary>

Ix.NET/Source/System.Interactive/System/Linq/Operators/TakeLast.cs

@@ -8,7 +8,7 @@ namespace System.Linq
 {
     public static partial class EnumerableEx
     {
-#if !(REFERENCE_ASSEMBLY && (NETCOREAPP2_1 || NETSTANDARD2_1 ))
+#if !(REFERENCE_ASSEMBLY && (NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER ))
         /// <summary>
         /// Returns a specified number of contiguous elements from the end of the sequence.
         /// </summary>