Provider Control: fix PCL builds

src/Numerics/Providers/FourierTransform/FourierTransformControl.cs

@@ -50,6 +50,14 @@ namespace MathNet.Numerics.Providers.FourierTransform
         {
             return TryUse(new Mkl.MklFourierTransformProvider());
         }
+
+        /// <summary>
+        /// Try to use a native provider, if available.
+        /// </summary>
+        public static bool TryUseNative()
+        {
+            return TryUseNativeMKL();
+        }
 #endif
 
         static bool TryUse(IFourierTransformProvider provider)
@@ -71,14 +79,6 @@ namespace MathNet.Numerics.Providers.FourierTransform
             }
         }
 
-        /// <summary>
-        /// Try to use a native provider, if available.
-        /// </summary>
-        public static bool TryUseNative()
-        {
-            return TryUseNativeMKL();
-        }
-
         /// <summary>
         /// Use the best provider available.
         /// </summary>

src/Numerics/Providers/LinearAlgebra/LinearAlgebraControl.cs

@@ -78,6 +78,14 @@ namespace MathNet.Numerics.Providers.LinearAlgebra
         {
             return TryUse(new OpenBlas.OpenBlasLinearAlgebraProvider());
         }
+
+        /// <summary>
+        /// Try to use a native provider, if available.
+        /// </summary>
+        public static bool TryUseNative()
+        {
+            return TryUseNativeCUDA() || TryUseNativeMKL() || TryUseNativeOpenBLAS();
+        }
 #endif
 
         static bool TryUse(ILinearAlgebraProvider provider)
@@ -99,14 +107,6 @@ namespace MathNet.Numerics.Providers.LinearAlgebra
             }
         }
 
-        /// <summary>
-        /// Try to use a native provider, if available.
-        /// </summary>
-        public static bool TryUseNative()
-        {
-            return TryUseNativeCUDA() || TryUseNativeMKL() || TryUseNativeOpenBLAS();
-        }
-
         /// <summary>
         /// Use the best provider available.
         /// </summary>