Inflict PPDF_ENABLE_XFA ifdefs on XFA core/

core/src/fxcrt/fx_basic_buffer.cpp

Index: core/src/fxcrt/fx_basic_buffer.cpp
diff --git a/core/src/fxcrt/fx_basic_buffer.cpp b/core/src/fxcrt/fx_basic_buffer.cpp
index f606f1d368e04328264d1f2de9343256d502da5f..e5aa37c1bcfcab996cc1362f8dde8328e8a4c486 100644
--- a/core/src/fxcrt/fx_basic_buffer.cpp
+++ b/core/src/fxcrt/fx_basic_buffer.cpp
@@ -207,6 +207,7 @@ CFX_WideStringC CFX_WideTextBuf::GetWideString() const {
   return CFX_WideStringC((const FX_WCHAR*)m_pBuffer,
                          m_DataSize / sizeof(FX_WCHAR));
 }
+#ifdef PDF_ENABLE_XFA
 CFX_ArchiveSaver& CFX_ArchiveSaver::operator<<(uint8_t i) {
   if (m_pStream) {
     m_pStream->WriteBlock(&i, 1);
@@ -330,6 +331,7 @@ FX_BOOL CFX_ArchiveLoader::Read(void* pBuf, FX_DWORD dwSize) {
   m_LoadingPos += dwSize;
   return TRUE;
 }
+#endif
 void CFX_BitStream::Init(const uint8_t* pData, FX_DWORD dwSize) {
   m_pData = pData;
   m_BitSize = dwSize * 8;