[libc++] Change linkage for some functions.

[Mordante]

Summary

Internal linkages fails when building libc++ with modules. Using
internal linkage is headers seems questionable to change the linkage.

libcxx/include/__algorithm/ranges_find_if.h

 
 #if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
 
 template <class _Ip, class _Sp, class _Pred, class _Proj>
-_LIBCPP_HIDE_FROM_ABI static constexpr
+_LIBCPP_HIDE_FROM_ABI constexpr
 _Ip __find_if_impl(_Ip __first, _Sp __last, _Pred& __pred, _Proj& __proj) {
   for (; __first != __last; ++__first) {
     if (std::invoke(__pred, std::invoke(__proj, *__first)))
       break;
   }
   return __first;
 }
 

libcxx/include/__algorithm/ranges_min_element.h

 #if _LIBCPP_STD_VER >= 20
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace ranges {
 
 // TODO(ranges): `ranges::min_element` can now simply delegate to `std::__min_element`.
 template <class _Ip, class _Sp, class _Proj, class _Comp>
-_LIBCPP_HIDE_FROM_ABI static constexpr
+_LIBCPP_HIDE_FROM_ABI constexpr
 _Ip __min_element_impl(_Ip __first, _Sp __last, _Comp& __comp, _Proj& __proj) {
   if (__first == __last)
     return __first;
 
   _Ip __i = __first;
   while (++__i != __last)
     if (std::invoke(__comp, std::invoke(__proj, *__i), std::invoke(__proj, *__first)))
       __first = __i;