[Bug 268329] lang/gjs: fix build with clang/libc++ 15

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268329

            Bug ID: 268329
           Summary: lang/gjs: fix build with clang/libc++ 15
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: gnome@FreeBSD.org
          Reporter: dim@FreeBSD.org
          Assignee: gnome@FreeBSD.org
             Flags: maintainer-feedback?(gnome@FreeBSD.org)

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

  In file included from ../test/gjs-tests.cpp:11:
  In file included from /usr/include/c++/v1/random:1689:
  In file included from
/usr/include/c++/v1/__random/discrete_distribution.h:18:
  In file included from /usr/include/c++/v1/numeric:167:
  In file included from /usr/include/c++/v1/functional:515:
  In file included from
/usr/include/c++/v1/__functional/boyer_moore_searcher.h:24:
  In file included from /usr/include/c++/v1/array:127:
  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:162:5: error: static
assertion failed due to requirement
'__libcpp_random_is_valid_inttype<char32_t>::value': IntType must be a
supported integer type
      static_assert(__libcpp_random_is_valid_inttype<_IntType>::value, "IntType
must be a supported integer type");
      ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  ../test/gjs-tests.cpp:71:16: note: in instantiation of template class
'std::uniform_int_distribution<char32_t>' requested here
          return std::uniform_int_distribution<T>(lowest_value)(gen);
                 ^
  ../test/gjs-tests.cpp:942:30: note: in instantiation of function template
specialization 'Gjs::Test::get_random_number<char32_t>' requested here
      char32_t random_char32 = get_random_number<char32_t>();
                               ^

This is because std::uniform_int_distribution is only defined for strict
integer types, such as short, int, etc. Use
std::uniform_int_distribution<uint32_t> instead, and cast the result back to a
char32_t.

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