fix swap of eastl::list<unique_ptr[]>

[virt00l]

...or any other type that has deleted dtor.

const this_type temp(*this); // << This would attept to call copy ctor of unique_ptr<> which is explicitly deleted
*this = x;
x     = temp;

[virt00l]

Nvm, this did not fix it. WIP, please don't merge (yet)

[virt00l]

Okay. Now fixed. Code like

eastl::list<eastl::unique_ptr<T>> foo, bar;
foo.swap(bar)

now compiles (but require EASTL_NAME_ENABLED being off)