internal: use libsmarter

[64]

See also managarm/libsmarter#4.

[64]

libsmarter's make_shared at least seems to call operator new.

[64]

Ah, okay. allocate_shared should do the same thing as make_shared but take an explicit allocator. We can just use that, then.

[Geertiebear]

Why do we need this? The PR does not immediately add a usecase for libsmarter so I'm curious what you want to use it for.

[64]

IIRC I wanted to use it for refcounting stuff in ld.so so that we don't e.g leak memory when we destroy threads. This PR needs a bit of updating as per my last comment, though

[Geertiebear]

Alright, but then at leas the use-case is clear, thanks.