ghostscript: Update to version 9.56.1

ghostscript: Update to version 9.56.1

- Update from 9.55.0 to 9.56.1
- Update of rootfile
- Changelog
   Version 9.56.0 (2022-02-22)
     Highlights in this release include:
	    New PDF Interpreter: This is an entirely new implementation written in C
             (rather than PostScript, as before). For a full discussion of this change
             and reasons for it see: Changes Coming to the PDF Interpreter.
	    In this (9.56.0) release, the new PDF interpreter is now ENABLED by default
             in Ghostscript, but the old PDF interpreter can be used as a fallback by
             specifying -dNEWPDF=false. We've provided this so users that encounter
             issues with the new interpreter can keep working while we iron out those
             issues, the option will not be available in the long term.
	    This also allows us to offer a new executable (gpdf, or gpdfwin??.exe on
             Windows) which is purely for PDF input. For this release, those new binaries
             are not included in the "install" make targets, nor in the Windows installers.
	    Calling Ghostscript via the GS API is now thread safe. The one limitation is
             that the X11 devices for Unix-like systems (x11, x11alpha, x11cmyk, x11cmyk2,
             x11cmyk4, x11cmyk8, x11gray2, x11gray4 and x11mono) cannot be made thread
             safe, due to their interaction with the X11 server, those devices have been
             modified to only allow one instance in an executable.
	    The PSD output device now writes ICC profiles to their output files, for
             improved color fidelity.
	    Our efforts in code hygiene and maintainability continue.
	    The usual round of bug fixes, compatibility changes, and incremental
             improvements.
     Included below are incompatible changes from recent releases (the specific release
      in question is listed in parentheses). We include these, for now, as we are aware
      that not everyone upgrades with every release.
	    (9.55.0) Changes to the device API. This will affect developers and
                      maintainers of Ghostscript devices. Firstly, and most importantly,
                      the way device-specific "procs" are specified has been rewritten
                      to make it (we think!) clearer and less confusing. See The
                      Interface between Ghostscript and Device Drivers and The Great
                      Device Rework Of 2021 for more details.
	    (9.55.0) The command line options -sGraphicsICCProfile=___,
                      -dGraphicsIntent=#, -dGraphicsBlackPt=#, -dGraphicsKPreserve=# have
                      been changed to -sVectorICCProfile=___, -dVectorIntent=#,
                      -dVectorBlackPt=#, -dVectorKPreserve=#.
	    (9.53.0) As of 9.53.0, we have (re-)introduced the patch level to the
                      version number, this helps facilitate a revised policy on handling
                      security-related issues.
	    Note for GSView Users: The patch level addition breaks GSView 5 (it is
             hardcoded to check for versions 704-999. It is possible, but not guaranteed
             that a GSView update might be forthcoming to resolve this.
	    (9.52) -dALLOWPSTRANSPARENCY: The transparency compositor (and related
                    features), whilst we are improving it, remains sensitive to being
                    driven correctly, and incorrect use can have unexpected/undefined
                    results. Hence, as part of improving security, we limited access to
                    these operators, originally using the -dSAFER feature. As we made
                    "SAFER" the default mode, that became unacceptable, hence the new
                    option -dALLOWPSTRANSPARENCY which enables access to the operators.
	    (9.50) There are a couple of subtle incompatibilities between the old and
                    new SAFER implementations. Firstly, as mentioned in the 9.50 release
                    notes, SAFER now leaves standard PostScript functionality unchanged
                    (except for the file access limitations). Secondly, the interaction
                    with save/restore operations has changed. See SAFER.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>