Draft: gconstructor: Disable constructors/destructors on muslc

As per https://wiki.musl-libc.org/functional-differences-from-glibc.html#Unloading_libraries, muslc intentionally doesn’t call destructors during dlclose(). This is a significant behaviour difference from all other platforms we support, and it’s not something we can abstract away.

In particular, it breaks assumptions in the resources test about resources from modules being correctly unloaded when the module is unloaded.

Signed-off-by: Philip Withnall philip@tecnocode.co.uk

Fixes: #3160

Closes #3160