fix: pass sancov or sancov-module

[PsiACE]

Fixes: #61

The fix for now is to pass -C passes=sancov-module to compilers for which the LLVM version is >= 13.

[taiki-e]

Note that this is currently only needed for the nightly compiler: https://github.com/rust-fuzz/afl.rs/pull/197

[PsiACE]

Note that this is currently only needed for the nightly compiler: rust-fuzz/afl.rs#197

ok, I will change to version_meta.channel == rustc_version::Channel::Nightly && version_meta.llvm_version.map_or(true, |v| v.major >= 13)

[PsiACE]

cc @taiki-e , Done!

[PaulGrandperrin]

Thanks @taiki-e and @PsiACE for this patch!

And sorry for the looong delay :/