Re-enable several MSVC warnings

core/fxge/win32/fx_win32_gdipext.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 "core/include/fxge/fx_ge.h"
 
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_DESKTOP_
 #include <windows.h>
@@ skipping 964 matching lines @@
   if (!bTextMode) {
     FX_FLOAT unit =
         pMatrix ? 1.0f / ((pMatrix->GetXUnit() + pMatrix->GetYUnit()) / 2)
                 : 1.0f;
     if (width < unit) {
       width = unit;
     }
   }
   GpPen* pPen = NULL;
   CallFunc(GdipCreatePen1)((ARGB)argb, width, UnitWorld, &pPen);
-  LineCap lineCap;
+  LineCap lineCap = LineCapFlat;
   DashCap dashCap = DashCapFlat;
   FX_BOOL bDashExtend = FALSE;
   switch (pGraphState->m_LineCap) {
     case CFX_GraphStateData::LineCapButt:
       lineCap = LineCapFlat;
       break;
     case CFX_GraphStateData::LineCapRound:
       lineCap = LineCapRound;
       dashCap = DashCapRound;
       bDashExtend = TRUE;
       break;
     case CFX_GraphStateData::LineCapSquare:
       lineCap = LineCapSquare;
       bDashExtend = TRUE;
       break;
   }
   CallFunc(GdipSetPenLineCap197819)(pPen, lineCap, lineCap, dashCap);
-  LineJoin lineJoin;
+  LineJoin lineJoin = LineJoinMiterClipped;
   switch (pGraphState->m_LineJoin) {
     case CFX_GraphStateData::LineJoinMiter:
       lineJoin = LineJoinMiterClipped;
       break;
     case CFX_GraphStateData::LineJoinRound:
       lineJoin = LineJoinRound;
       break;
     case CFX_GraphStateData::LineJoinBevel:
       lineJoin = LineJoinBevel;
       break;
@@ skipping 495 matching lines @@
                    dest_pitch);
     }
   }
   CFX_DIBitmap* pDIBitmap = _FX_WindowsDIB_LoadFromBuf(
       pInfo->pbmi, pData, pInfo->pbmi->bmiHeader.biBitCount == 32);
   FX_Free(pData);
   FreeDIBitmap(pInfo);
   return pDIBitmap;
 }
 #endif