Disable Boost's deque forward declaration

[ximinez]

High Level Overview of Change

Does what it says on the tin: Defines a build variable that tells Boost to include deque directly instead of trying to predeclare it. That variable is called BOOST_CONTAINER_FWD_BAD_DEQUE,

Context of Change

After upgrading Boost from 1.70 to 1.75, building in Visual Studio 2017 would fail, giving errors about std::deque missing template parameters. The boost/detail/container_fwd.hpp tries to forward declare the std::deque template without specifying default paramters. Defining BOOST_CONTAINER_FWD_BAD_DEQUE simply includes the deque header and removes the forward declaration.

I realized at some point that I had already "fixed" this issue in #3851 with the commit labelled "Add missing "deque" headers in a bunch of places". This fix is simpler and therefore better. It's also now causing problems across branches, so I'm making a separate PR for it.

Type of Change

• [X ] Bug fix (non-breaking change which fixes an issue)

Test Plan

This is only a build issue. There is nothing to test.

[cjcobb23]

Thanks for fixing this. LGTM.

[seelabs]

👍 LGTM

[manojsdoshi]

"Merged as part of #3948"