wow64win: Add missing syscall for NtUserGetClassName().

dlls/wow64win/syscall.h

@@ -101,6 +101,7 @@
     SYSCALL_ENTRY( NtUserFindExistingCursorIcon ) \
     SYSCALL_ENTRY( NtUserGetAncestor ) \
     SYSCALL_ENTRY( NtUserGetAtomName ) \
+    SYSCALL_ENTRY( NtUserGetClassName ) \
     SYSCALL_ENTRY( NtUserGetClipboardFormatName ) \
     SYSCALL_ENTRY( NtUserGetClipboardOwner ) \
     SYSCALL_ENTRY( NtUserGetClipboardSequenceNumber ) \

dlls/wow64win/user.c

@@ -199,6 +199,17 @@ NTSTATUS WINAPI wow64_NtUserGetAtomName( UINT *args )
     return NtUserGetAtomName( atom, unicode_str_32to64( &str, str32 ));
 }
 
+NTSTATUS WINAPI wow64_NtUserGetClassName( UINT *args )
+{
+    HWND hwnd = get_handle( &args );
+    BOOL real = get_ulong( &args );
+    UNICODE_STRING32 *str32 = get_ptr( &args );
+
+    UNICODE_STRING str;
+
+    return NtUserGetClassName( hwnd, real, unicode_str_32to64( &str, str32 ));
+}
+
 NTSTATUS WINAPI wow64_NtUserGetAncestor( UINT *args )
 {
     HWND hwnd = get_handle( &args );