[XrdCl] Avoid deadlock when stopping the poller
[XrdCl] Async socket should delete a partially received message only when it has the ownership
[CMake] Add XrdNetIF.hh to the list of installable private headers
[Headers] Make the public headers compile with gcc -Wall -Wextra -Werror
[CMake] Install XrdSysLinusSemaphore.hh
[XrdCl] Set the target file access mode to 644 when copying to root://
[XrdCl] Correct a typo in the help message