Missing references to some nightly compilers

[partouf]

• /opt/compiler-explorer/llvm-mos-trunk/bin/clang - this is because we point to the various symlinks
• /opt/compiler-explorer/bpf/gcc-trunk/bpf-unknown-none/bin/bpf-unknown-g++
• /opt/compiler-explorer/carbon-trunk/bin/carbon-explorer
• /opt/compiler-explorer/cobol/gcc-cobol-master/bin/gcobol
• /opt/compiler-explorer/dotnet-trunk/.dotnet/dotnet - this might be because we use specific executables for the various languages
• /opt/compiler-explorer/hook/hook-0.1.0/bin/hook
• /opt/compiler-explorer/SPIRV-Tools-master/build/tools/spirv-dis - we use this, but don't have it as a compiler, so this is expected
• /opt/compiler-explorer/llvm-spirv-trunk/bin/llvm-spirv - same, not a compiler
• /opt/compiler-explorer/swift-5.10/usr/bin/swiftc - fixed with compiler-explorer/compiler-explorer@e45ba2d