Fix entrypoint name. (#65745)

Fixes #65648

Author: jkoritzinsky

src/libraries/Common/tests/TestUtilities/System/WindowsIdentityFixture.cs

@@ -109,10 +109,9 @@ private void CreateUser()
             }
         }
 
-        [GeneratedDllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+        [GeneratedDllImport("advapi32.dll", EntryPoint = "LogonUserW", SetLastError = true, CharSet = CharSet.Unicode)]
         private static partial bool LogonUser(string userName, string domain, string password, int logonType, int logonProvider, out SafeAccessTokenHandle safeAccessTokenHandle);
 
-
 #pragma warning disable DLLIMPORTGENANALYZER015 // Use 'GeneratedDllImportAttribute' instead of 'DllImportAttribute' to generate P/Invoke marshalling code at compile time
         // TODO: [DllImportGenerator] Switch to use GeneratedDllImport once we add support for non-blittable struct marshalling.
         [DllImport("netapi32.dll", CharSet = CharSet.Unicode, SetLastError = true)]