base/std_cxx17: remove std::cyl_bessel_jl boost substitutes

diff --git a/include/deal.II/base/std_cxx17/cmath.h b/include/deal.II/base/std_cxx17/cmath.h
index fd6a694a6a97867bf3a2cf7705af9d9ae57faf85..2e4d3dc777c9b5d3829bb4414ac6ce5342d8df37 100644 (file)
--- a/include/deal.II/base/std_cxx17/cmath.h
+++ b/include/deal.II/base/std_cxx17/cmath.h
@@ -55,18 +55,9 @@ namespace std_cxx17
     return boost::math::cyl_bessel_j(nu, x);
   }
 
-
-
-  inline long double
-  cyl_bessel_jl(long double nu, long double x)
-  {
-    return boost::math::cyl_bessel_j(nu, x);
-  }
-
 #else
   using std::cyl_bessel_j;
   using std::cyl_bessel_jf;
-  using std::cyl_bessel_jl;
 #endif
 
 #ifndef DEAL_II_HAVE_CXX17_LEGENDRE_FUNCTIONS