math/R-cran-isoband: fix build with clang/libc++ 15

During an exp-run for llvm 15 (see bug 265425), it turned out that
math/R-cran-isoband failed to build with clang and libc++ 15:

  In file included from test-runner.cpp:8:
  In file included from testthat/testthat.h:65:
  In file included from testthat/vendor/catch.h:377:
  In file included from /usr/include/c++/v1/sstream:186:
  In file included from /usr/include/c++/v1/istream:165:
  In file included from /usr/include/c++/v1/ostream:168:
  In file included from /usr/include/c++/v1/bitset:128:
  In file included from /usr/include/c++/v1/string:551:
  In file included from /usr/include/c++/v1/string_view:222:
  In file included from /usr/include/c++/v1/algorithm:1851:
  In file included from /usr/include/c++/v1/__algorithm/ranges_sample.h:13:
  In file included from /usr/include/c++/v1/__algorithm/sample.h:18:
  /usr/include/c++/v1/__random/uniform_int_distribution.h:235:5: error: static assertion failed due to requirement '__libcpp_random_is_valid_urng<Catch::RandomNumberGenerator, void>::value':
      static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
      ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /usr/include/c++/v1/__algorithm/shuffle.h:154:35: note: in instantiation of function template specialization 'std::uniform_int_distribution<>::operator()<Catch::RandomNumberGenerator>' requested here
              difference_type __i = __uid(__g, _Pp(0, __d));
                                    ^
  /usr/include/c++/v1/__algorithm/shuffle.h:166:14: note: in instantiation of function template specialization 'std::__shuffle<std::_ClassicAlgPolicy, std::__wrap_iter<Catch::TestCase *>, std::__wrap_iter<Catch::TestCase *>, Catch::RandomNumberGenerator &>' requested here
    (void)std::__shuffle<_ClassicAlgPolicy>(
               ^
  testthat/vendor/catch.h:7189:18: note: in instantiation of function template specialization 'std::shuffle<std::__wrap_iter<Catch::TestCase *>, Catch::RandomNumberGenerator &>' requested here
              std::shuffle( vector.begin(), vector.end(), rng );
                   ^
  testthat/vendor/catch.h:7207:44: note: in instantiation of function template specialization 'Catch::RandomNumberGenerator::shuffle<std::vector<Catch::TestCase>>' requested here
                      RandomNumberGenerator::shuffle( sorted );
                                             ^

This was fixed in https://github.com/r-lib/testthat/commit/81dfbed7 by
upstream.

PR:		268337
Approved by:	portmgr (tcberner)
MFH:		2022Q4

math/R-cran-isoband/files/patch-commit-81dfbed7

@@ -0,0 +1,48 @@
+commit 81dfbed7428a526acf7c97937902fc36d7eaeb21
+Author: Kevin Ushey <kevinushey@gmail.com>
+Date:   Wed Sep 21 15:50:44 2022 -0700
+
+    Use compatible RNG with shuffle (#1688)
+    
+    Fixes #1687
+
+diff --git src/testthat/vendor/catch.h src/testthat/vendor/catch.h
+index e8a10b07..83818641 100644
+--- src/testthat/vendor/catch.h
++++ src/testthat/vendor/catch.h
+@@ -7165,27 +7165,23 @@ namespace Catch {
+ // #included from: catch_test_case_registry_impl.hpp
+ #define TWOBLUECUBES_CATCH_TEST_CASE_REGISTRY_IMPL_HPP_INCLUDED
+ 
+-#include <vector>
++#include <algorithm>
+ #include <set>
+ #include <sstream>
+-#include <algorithm>
++#include <vector>
++
++#ifdef CATCH_CONFIG_CPP11_SHUFFLE
++#include <random>
++#endif
+ 
+ namespace Catch {
+ 
+     struct RandomNumberGenerator {
+-        typedef std::ptrdiff_t result_type;
+-
+-        result_type operator()( result_type n ) const { return rand() % n; }
+-
+-#ifdef CATCH_CONFIG_CPP11_SHUFFLE
+-        static constexpr result_type min() { return 0; }
+-        static constexpr result_type max() { return 1000000; }
+-        result_type operator()() const { return rand() % max(); }
+-#endif
+         template<typename V>
+         static void shuffle( V& vector ) {
+-            RandomNumberGenerator rng;
+ #ifdef CATCH_CONFIG_CPP11_SHUFFLE
++            std::random_device device;
++            std::mt19937 rng( device() );
+             std::shuffle( vector.begin(), vector.end(), rng );
+ #else
+             random_shuffle( vector.begin(), vector.end(), rng );