array.H: include cstdint to fix llvm 12+ build

[ghost]

include cstdint in arrah.H to fix build errors when compiling with llvm-12+.

include/hobbes/util/array.H:325:22: error: unknown type name 'uint8_t'

[mo-xiaoming]

Hi @a-n-n-a-l-e-e , for the moment, hobbes doesn't support llvm12+, at least not officially

[ghost]

Hi @a-n-n-a-l-e-e , for the moment, hobbes doesn't support llvm12+, at least not officially

thats fine -- no harm in adding the header that is responsible for uint8_t tho.
https://en.cppreference.com/w/cpp/header/cstdint

feel free to close.

[wegank]

Hi @a-n-n-a-l-e-e , for the moment, hobbes doesn't support llvm12+, at least not officially

In Nixpkgs we do link against LLVM 12. Building the package is another story, and I believe <cstdint> is a missing header for both GCC 13 and Clang 16. So it'll be nice to get this PR in.