Log Message:
libfilezilla: update to 0.47.0.

New features:

    PKCS#11 support, provided GnuTLS has been compiled with PKCS#11 support enabled

Bugfixes and minor changes:

    Added parameter to fz::remove_dir that allows returning an error if the \ 
directory did not exist
    Add logging of aio reader/writers cannot be opened, fix return value of \ 
reader when trying to read nothing
    HTTP: Delay sending subsequent requests after having received a response \ 
with "Connection: close" set
    Listen sockets are now created with the SO_REUSEADDR (SO_EXCLUSIVEADDRUSE on \ 
Windows) flag set
    Added cert_type::codesign as key purpose to certificate request and creation \ 
functions in fz::tls_layer