修复远程桌面跟踪鼠标不准的问题

添加比zstd更快的压缩库lz4。

server/2015Remote/Buffer.cpp

@@ -162,7 +162,7 @@ VOID CBuffer::ClearBuffer()
 	LeaveCriticalSection(&m_cs);
 }
 
-ULONG CBuffer::GetBufferLength() //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><D0A7><EFBFBD>ݳ<EFBFBD><DDB3><EFBFBD>
+ULONG CBuffer::GetBufferLength() const //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><D0A7><EFBFBD>ݳ<EFBFBD><DDB3><EFBFBD>
 {
 	if (m_Base == NULL)
 		return 0;
@@ -171,12 +171,12 @@ ULONG CBuffer::GetBufferLength() //
 }
 
 
-ULONG CBuffer::GetBufferMaxLength()   
+ULONG CBuffer::GetBufferMaxLength() const
 {
 	return m_ulMaxLength;
 }
 
-PBYTE CBuffer::GetBuffer(ULONG ulPos)
+PBYTE CBuffer::GetBuffer(ULONG ulPos) const
 {
 	if (m_Base==NULL)
 	{