lang/spidermonkey102: fix build with clang and libc++ 19

Clang 19 now diagnoses incorrect member accesses, which causes
lang/spidermonkey102 to fail with an error similar to:

   
/wrkdirs/usr/ports/lang/spidermonkey102/work/firefox-102.9.0/js/src/threading/ExclusiveData.h:113:29:
error: reference to non-static member function must be called
      113 |       : lock_(std::move(rhs.lock)), value_(std::move(rhs.value_)) {
          |                         ~~~~^~~~

Upstream fixed this for https://bugzilla.mozilla.org/1894423 in
changeset 223087fdc29f18678f6174e9807b8780e439acf6 [2], so pull this in
as a patch and apply it.

Also, as noted in the libc++ 19 release notes [1], std::char_traits<> is
now only provided for char, char8_t, char16_t, char32_t and wchar_t, and