maintainer-feedback requested: [Bug 295509] graphics/krita: fix build with libc++ 21

Bugzilla Automation <[email protected]> has asked freebsd-kde (group)
<[email protected]> for maintainer-feedback:
Bug 295509: graphics/krita: fix build with libc++ 21
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295509



--- Description ---
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/KoColorDisplayRendererInte
rface.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.