[Bug 295509] graphics/krita: fix build with libc++ 21

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295509

            Bug ID: 295509
           Summary: graphics/krita: fix build with libc++ 21
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde at FreeBSD.org
          Reporter: dim at FreeBSD.org
          Assignee: kde at FreeBSD.org
             Flags: maintainer-feedback?(kde at FreeBSD.org)

After libc++ was imported in base 700637cbb5e582861067a11aaca4d053546871d2,
graphics/krita fails to compile, with errors similar to:

  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/mocs_compilation.cpp:2:
  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/EWIEGA46WW/moc_KoColorDisplayRendererInterface.cpp:10:
  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/EWIEGA46WW/../../../../../krita-5.2.14/libs/pigment/KoColorDisplayRendererInterface.h:14:
  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/EWIEGA46WW/../../../../../krita-5.2.14/libs/pigment/KoColor.h:16:
  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/EWIEGA46WW/../../../../../krita-5.2.14/libs/pigment/KoColorSpaceTraits.h:14:
  In file included from
/wrkdirs/usr/ports/graphics/krita/work/.build/libs/pigment/kritapigment_autogen/EWIEGA46WW/../../../../../krita-5.2.14/libs/pigment/KoColorSpaceMaths.h:109:
 
/wrkdirs/usr/ports/graphics/krita/work/krita-5.2.14/libs/global/KisHalfTraits.h:33:10:
error: no template named '__libcpp_is_integral'; did you mean
'__libcpp_is_final'?
     33 |   struct __libcpp_is_integral<half>
        |          ^~~~~~~~~~~~~~~~~~~~
        |          __libcpp_is_final
  /usr/include/c++/v1/__type_traits/is_final.h:22:8: note: '__libcpp_is_final'
declared here
     22 | struct __libcpp_is_final : integral_constant<bool, __is_final(_Tp)>
{};
        |        ^

This is because overriding std::is_integral is no longer supported. Patch out
the offending code for libc++ >= 21.

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