clipper2: Update to 1.4.0

[Chubercik]

https://github.com/AngusJohnson/Clipper2/releases/tag/Clipper2_1.4.0

• Updated COPYRIGHT.txt
• Regenerated patches

cc @smix8

[Chubercik]

Uh-oh: llvm/llvm-project#16778

Edit: fixed by opting out of 128bit arithmetic (see patches)

Edit 2: more specifically, the issue is as follows:

1. Compiler-RT implements functions that libgcc doesn’t (ex. __muloti4).
2. LLVM lowers 128-bit arithmetic to calls to that builtin, because the target (AArch64) said it supports.
3. The linker fails to find the symbol because the actual runtime (libgcc) doesn’t.

See: [Proposal] split built-ins from the rest of “compiler-rt”

[akien-mga]

Seems good to me, if it works :D

Needs rebase to remove the merge commit.

[Chubercik]

Rebased :)

[Repiteo]

Thanks!