Test icpx instead of icpc

[masterleinad]

Fixes #15301. We could of course add this as an extra build.

[bangerth]

Nice catch!

[bangerth]

?? Do we use this class anywhere so that we want to un-deprecate it?

[masterleinad]

Ah, forgot to hit send:
All its members are deprecated so this only avoids deprecation warnings when defining those in the *.cc file.

[masterleinad]

/rebuild

[marcfehling]

The windows tester doesn't like this:

D:\a\dealii\dealii\source\base\qprojector.cc(772,43): error C2664: 'dealii::ArrayView<const dealii::Point<2,Number>,dealii::MemorySpace::Host>::ArrayView(const dealii::Point<2,Number> *,const size_t)': cannot convert argument 1 from 'std::_Array_const_iterator<_Ty,2>' to 'const dealii::Point<2,Number> *' [D:\a\dealii\dealii\build\source\base\object_base_debug.vcxproj]
          with
          [
              Number=double
          ]
          and
          [
              _Ty=dealii::Point<2,double>
          ]
          and
          [
              Number=double
          ]
D:\a\dealii\dealii\source\base\qprojector.cc(772,60): message : No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called [D:\a\dealii\dealii\build\source\base\object_base_debug.vcxproj]
D:\a\dealii\dealii\include\deal.II/base/array_view.h(128,3): message : see declaration of 'dealii::ArrayView<const dealii::Point<2,Number>,dealii::MemorySpace::Host>::ArrayView' [D:\a\dealii\dealii\build\source\base\object_base_debug.vcxproj]
          with
          [
              Number=double
          ]
D:\a\dealii\dealii\source\base\qprojector.cc(805): message : see reference to function template instantiation 'std::vector<dealii::Point<2,Number>,std::allocator<dealii::Point<2,Number>>> dealii::QProjector<2>::project_to_all_faces::<lambda_0c83d88963be66288dded01df112f8f9>::operator ()<_Ty,unsigned int>(const _Ty &,const unsigned int &) const' being compiled [D:\a\dealii\dealii\build\source\base\object_base_debug.vcxproj]
          with
          [
              Number=double,
              _Ty=std::pair<std::array<dealii::Point<2,double>,2>,double>
          ]
  fe_dgp_monomial.cc
D:\a\dealii\dealii\source\base\qprojector.cc(804): message : see reference to function template instantiation 'std::vector<dealii::Point<2,Number>,std::allocator<dealii::Point<2,Number>>> dealii::QProjector<2>::project_to_all_faces::<lambda_0c83d88963be66288dded01df112f8f9>::operator ()<_Ty,unsigned int>(const _Ty &,const unsigned int &) const' being compiled [D:\a\dealii\dealii\build\source\base\object_base_debug.vcxproj]
          with
          [
              Number=double,
              _Ty=std::pair<std::array<dealii::Point<2,double>,2>,double>
          ]

[marcfehling]

MSVC looks happy now :)