Allow building of XFA branch without XFA

fpdfsdk/src/fpdfsave.cpp

Index: fpdfsdk/src/fpdfsave.cpp
diff --git a/fpdfsdk/src/fpdfsave.cpp b/fpdfsdk/src/fpdfsave.cpp
index 7a666bceb865055ae2b2c4f574e74023cf277e87..2cfbb81cd0790edc78164d6abfef4b8ebbbdf5fb 100644
--- a/fpdfsdk/src/fpdfsave.cpp
+++ b/fpdfsdk/src/fpdfsave.cpp
@@ -60,6 +60,7 @@ void CFX_IFileWrite::Release() {
 
 FX_BOOL _SaveXFADocumentData(CPDFXFA_Document* pDocument,
                              CFX_PtrArray& fileList) {
+#ifdef PDF_ENABLE_XFA
   if (!pDocument)
     return FALSE;
   if (pDocument->GetDocType() != DOCTYPE_DYNIMIC_XFA &&
@@ -228,6 +229,8 @@ FX_BOOL _SaveXFADocumentData(CPDFXFA_Document* pDocument,
     }
   }
   pContext->Release();
+#endif  // PDF_ENABLE_XFA
+
   return TRUE;
 }