Add FPDF_FreeDefaultSystemFontInfo API

fpdfsdk/fpdfview_c_api_test.c

 // Copyright 2015 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.
 
 // This "C" (not "C++") file ensures that the public headers compile
 // and link for "C" (and not just "C++").
 
 #include <stdio.h>
 
 #include "fpdfsdk/fpdfview_c_api_test.h"
@@ skipping 140 matching lines @@
     CHK(FPDF_SaveWithVersion);
 
     // fpdf_searchex.h
     CHK(FPDFText_GetCharIndexFromTextIndex);
 
     // fpdf_sysfontinfo.h
     CHK(FPDF_GetDefaultTTFMap);
     CHK(FPDF_AddInstalledFont);
     CHK(FPDF_SetSystemFontInfo);
     CHK(FPDF_GetDefaultSystemFontInfo);
+    CHK(FPDF_FreeDefaultSystemFontInfo);
 
     // fpdf_text.h
     CHK(FPDFText_LoadPage);
     CHK(FPDFText_ClosePage);
     CHK(FPDFText_CountChars);
     CHK(FPDFText_GetUnicode);
     CHK(FPDFText_GetFontSize);
     CHK(FPDFText_GetCharBox);
     CHK(FPDFText_GetCharIndexAtPos);
     CHK(FPDFText_GetText);
@@ skipping 65 matching lines @@
 #ifdef PDF_ENABLE_XFA
     CHK(FPDF_BStr_Init);
     CHK(FPDF_BStr_Set);
     CHK(FPDF_BStr_Clear);
 #endif
 
     return 1;
 }
 
 #undef CHK