This allows Linux's no_new_privs restriction to be disabled when starting
the X server, which may be desirable if xrdp is running inside a kernel
confinement framework such as AppArmor or SELinux.
env.c : The value of XRDP_SESSION in the environment is now set to the
PID of the sesexec process, which ties up the session with the
output of "xrdp-sesadmin -c=list".
Later versions of xrdp-sesadmin can use this value to get
information about the current process.
