Update fprot-workstation-bin to version 4.5.3.

This addresses PR#29271.
Changes include:

Version 4.5.3 adds a new commandline switch to f-protd, '-fullreport'
and new possible summary codes (see man page for details).

Version 4.5.2 is a bugfix release; f-protd would misidentify .pdf files
and block them from being delivered.

Version 4.5.1 is a bugfix release to fix a bug in scan-mail.pl where
scan-mail.pl would exit after first scan request on some unix platforms,
because of differing signal mechanism between BSD and SysV

Version 4.5.0 contains various bugfixes and improvements to the
documentation and software.

o       check-updates.pl has been modified. It now identifies itself with a
        unique user-agent string containing information on OS, kernel and
        architecture.
o       contains a major overhaul of the virus scanning engine
        (new engine version 3.16.1).  These changes improve its
        detection capabilities.  The engine can now better detect and
        handle executable packers, often used by malware authors to conceal
        malicious code.
o       includes a more generic JPEG GDI+ exploit detection
o       includes EMF/WMF image format exploit detection
o       encrypted executables inside archives are now reported as
        "could be a suspicious file (encrypted program in archive)",
        previously reported as "could be a security risk".
o       The argument switch "-archive" has been changed to support the form
        "-archive=n" where n is a non-negative integer. This causes f-prot
        to scan only n levels deep into nested archives of supported types in
        order to protect against 'arhcive-bombs'.
        The old form "-archive" is still supported, although depreciated, and
        implies n==5. See the man page for details.
o       Minor modifications in the DTD for the f-prot daemon XML.
o       Bugfix where f-prot would return IO_ERROR when attempting to scan
        unsupported partial archive files, e.g. .z01 files
o       Improved RAR support. F-Prot fully supports rar versions 1.5, 2.0 and
        2.6 and partially supports rar 2.9 (doesn't support RAR Virtual
        Machine and the PPM model features)

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