Avoid two C-style FX_WCHAR* casts in pdfium

xfa/fgas/font/fgas_stdfontmgr.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fgas/font/fgas_stdfontmgr.h"
 
 #include "core/fxcrt/include/fx_stream.h"
 #include "core/fxge/include/fx_ge.h"
@@ skipping 427 matching lines @@
   return 1;
 }
 static void FX_EnumGdiFonts(CFX_FontDescriptors& fonts,
                             const FX_WCHAR* pwsFaceName,
                             FX_WCHAR wUnicode) {
   HDC hDC = ::GetDC(NULL);
   LOGFONTW lfFind;
   FXSYS_memset(&lfFind, 0, sizeof(lfFind));
   lfFind.lfCharSet = DEFAULT_CHARSET;
   if (pwsFaceName) {
-    FXSYS_wcsncpy((FX_WCHAR*)lfFind.lfFaceName, pwsFaceName, 31);
+    FXSYS_wcsncpy(lfFind.lfFaceName, pwsFaceName, 31);
     lfFind.lfFaceName[31] = 0;
   }
   EnumFontFamiliesExW(hDC, (LPLOGFONTW)&lfFind,
                       (FONTENUMPROCW)FX_GdiFontEnumProc, (LPARAM)&fonts, 0);
   ::ReleaseDC(NULL, hDC);
 }
 FX_LPEnumAllFonts FX_GetDefFontEnumerator() {
   return FX_EnumGdiFonts;
 }
 #else
@@ skipping 1027 matching lines @@
   }
 }
 int32_t CFX_FontMgrImp::IsPartName(const CFX_WideString& Name1,
                                    const CFX_WideString& Name2) {
   if (Name1.Find(Name2.c_str()) != -1) {
     return 1;
   }
   return 0;
 }
 #endif