Fix instantiation for add_entries_local_to_global

[zjiaqi2018]

add_entries_local_to_global currently is not instantiated for block systems, this should fix it. @tjhei

intel compiler complains with

ld.bfd: /work2/08254/jiaqi2/frontera/dealii/installed_intel_test_branch/lib/libdeal_II.so.10.0.0-pre: undefined reference to `void dealii::AffineConstraints<double>::add_entries_local_to_global<dealii::BlockDynamicSparsityPattern>(std::vector<unsigned long, std::allocator<unsigned long> > const&, dealii::AffineConstraints<double> const&, std::vector<unsigned long, std::allocator<unsigned long> > const&, dealii::BlockDynamicSparsityPattern&, bool, dealii::Table<2, bool> const&) const'
ld.bfd: /work2/08254/jiaqi2/frontera/dealii/installed_intel_test_branch/lib/libdeal_II.so.10.0.0-pre: undefined reference to `void dealii::AffineConstraints<float>::add_entries_local_to_global<dealii::BlockDynamicSparsityPattern>(std::vector<unsigned long, std::allocator<unsigned long> > const&, dealii::AffineConstraints<float> const&, std::vector<unsigned long, std::allocator<unsigned long> > const&, dealii::BlockDynamicSparsityPattern&, bool, dealii::Table<2, bool> const&) const'

[tjhei]

This was broken in #13415

[tjhei]

/rebuild