Make (and verify) public/ files compile under C.

public/fpdfview.h

 // 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
 
 // NOTE: External docs refer to this file as "fpdfview.h", so do not rename
 // despite lack of consitency with other public files.
 
 #ifndef _FPDFVIEW_H_
@@ skipping 605 matching lines @@
 DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document);
 
 // Function: FPDF_GetNamedDestByName
 //                      get a special dest handle by the index.
 // Parameters: 
 //                      document        -       Handle to the loaded document.
 //                      name            -       The name of a special named dest.
 // Return value:
 //                      The handle of the dest.
 //
-DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,FPDF_BYTESTRING name);
+DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document, FPDF_BYTESTRING name);
 
 // Function: FPDF_GetNamedDest
 //                      Get the specified named destinations of the PDF document by index.
 // Parameters:
 //                      document        -       Handle to a document
 //                      index           -       The index of named destination.
 //                      buffer          -       The buffer to obtain destination name, used as wchar_t*.
 //                      buflen [in/out] -       Size of the buffer in bytes on input, length of the result in bytes on output or -1 if the buffer is too small.
 // Return value:
 //                      The destination handle of a named destination, or NULL if no named destination corresponding to |index|.
 // Comments:
 //                      Call this function twice to get the name of the named destination:
 //                      1) First time pass in |buffer| as NULL and get buflen.
 //                      2) Second time pass in allocated |buffer| and buflen to retrieve |buffer|, which should be used as wchar_t*.
 //                         If buflen is not sufficiently large, it will be set to -1 upon return.
 //
-DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index, void* buffer, long& buflen);
+DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index, void* buffer, long* buflen);
 
 
 #ifdef __cplusplus
 };
 #endif
 
 #endif // _FPDFVIEW_H_