Applied SuppressUnmanagedCodeSecurity to P/Invokes with WinApi calling conventions.

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2845,7 +2845,9 @@ namespace CppSharp.Generators.CSharp
                     : ((FunctionType) attributedType.Equivalent.Type).CallingConvention;
                 TypePrinter.PushContext(CSharpTypePrinterContextKind.Native);
                 var interopCallConv = callingConvention.ToInteropCallConv();
-                if (interopCallConv != System.Runtime.InteropServices.CallingConvention.Winapi)
+                if (interopCallConv == System.Runtime.InteropServices.CallingConvention.Winapi)
+                    WriteLine("[SuppressUnmanagedCodeSecurity]");
+                else
                     WriteLine(
                         "[SuppressUnmanagedCodeSecurity, " +
                         "UnmanagedFunctionPointerAttribute(global::System.Runtime.InteropServices.CallingConvention.{0})]",