CMake 2.8 does not support default visibility on windows.
To allow building tests add the FREERDP_LOCAL define for each
function that is internal to FreeRDP.
When build with testing these functions are exported and available
for use by tests.
This patch adds some callbacks so that the client can have access to the informations
stored in this packet. Server-side implementation is also there, so that a server
can send these informations to the client.
