Fix asm compiler detection

[AlexanderLanin]

I stumbled upon this due to a new setup.
Turns out CMake requires ASM to be the last parameter so it can try whether the C compiler can compile asm.
See https://gitlab.kitware.com/cmake/cmake/-/merge_requests/1560/diffs

How to reproduce

This might be not 100% accurate, it's from memory:

1. Install Ubuntu 18.04
2. sudo apt update
3. sudo apt upgrade
4. sudo apt install clang-10
5. sudo ln -s /usr/local/bin/c++ /usr/bin/clang++-10
6. sudo ln -s /usr/local/bin/cc /usr/bin/clang-10

And out of desperation:
7. sudo apt install build-essential

Actual behavior

-- The ASM compiler identification is unknown
-- Found assembler: /usr/local/bin/cc
-- The C compiler identification is Clang 10.0.0
-- The CXX compiler identification is Clang 10.0.0
-- Warning: Did not find file Compiler/-ASM
-- Check for working C compiler: /usr/local/bin/cc
-- Check for working C compiler: /usr/local/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/local/bin/c++
-- Check for working CXX compiler: /usr/local/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done

A little later blake3 fails since it doesn't expect to have to ASM compiler.
We could fix blake3 to use C code in case there is no ASM compiler.
But I guess we do want the ASM version since they specifically offer it.