Fix BitOperations defines

Author: JimBobSquarePants

msbuild/props/SixLabors.Global.props

@@ -127,7 +127,7 @@
     | >=netcoreapp3.1   |   Y   |    Y     |         Y           |      Y      |        Y        |        Y           |      Y       |    Y    |      Y     |       Y       |
     | netcoreapp2.1     |   Y   |    Y     |         Y           |      Y      |        Y        |        N           |      Y       |    N    |      Y     |       N       |
     | netcoreapp2.0     |   Y   |    N     |         N           |      N      |        N        |        N           |      Y       |    N    |      Y     |       N       |
-    | netstandard2.1    |   Y   |    Y     |         N           |      Y      |        Y        |        N           |      Y       |    N    |      Y     |       Y       |
+    | netstandard2.1    |   Y   |    Y     |         N           |      Y      |        Y        |        N           |      Y       |    N    |      Y     |       N       |
     | netstandard2.0    |   N   |    N     |         N           |      N      |        N        |        N           |      Y       |    N    |      N     |       N       |
     | netstandard1.3    |   N   |    N     |         N           |      N      |        N        |        N           |      N       |    N    |      N     |       N       |
     | net472, net48     |   N   |    N     |         Y           |      N      |        N        |        N           |      Y       |    N    |      N     |       N       |
@@ -154,7 +154,6 @@
         <DefineConstants>$(DefineConstants);SUPPORTS_ENCODING_STRING</DefineConstants>
         <DefineConstants>$(DefineConstants);SUPPORTS_CODECOVERAGE</DefineConstants>
         <DefineConstants>$(DefineConstants);SUPPORTS_CREATESPAN</DefineConstants>
-        <DefineConstants>$(DefineConstants);SUPPORTS_BITOPERATIONS</DefineConstants>
       </PropertyGroup>
     </When>
     <When Condition="'$(TargetFramework)' == 'netcoreapp2.0'">