lcms2: Update to version 2.13.1

lcms2: Update to version 2.13.1

- Update from 2.12 to 2.13.1
- Update of rootfile
- Changelog
   2.13.1 Hot fix
     Fix for pure white going gray in grayscale transforms.
   2.13 Featured release
     Added support for premultiplied alpha
     tifficc can now handle alpha channels, both unassociated and premultiplied
     Better documentation
     CGATS parser can now deal with very long strings
     Added Projects for Visual Studio 2020
     Travis CI discontinued, GitHub actions used instead
     Added a very preliminar meson build script (thanks to xclaesse)
     Added ARM64 target to visual studio 2019 (thanks to gaborkertesz-linaro)
     Added thread safe code to get time
     Added automatic linear space detection
     Added cmsGetStageContextID function
     Added cmsDetectRGBProfileGamma function
     configure now accepts --without-fastfloat to turn plugin off
     autogen.sh has now a --distclean toggle to get rid of all autotools generated files
     Checked to work on STM32 Cortex-A, Cortex-M families
     Bug & typos fixing (thanks to many reporters and contributors)

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