This commit removes a list we provide for the supported grcov formats.
In my opinion, this is a practice of bad software engineering, as we would then
have to maintain this list by ourselves.
Therefore, this commit removes this list from the `maint/with_coverage` script
and replaces it with a references to the accompanying grcov command.
This commit replaces all occurrences of `llvm-tools-preview` with
`llvm-tools`, because it became a stable feature with Rust 1.60, thereby
making the `-preview` prefix obsolete. Beside this, `llvm-tools-preview`
is a redirection to the latter one anyway.
However, it does not work the other way around. At the moment, it is not
possible to execute the `maint/coverage` script on a NixOS system,
because the rustup component list only includes `llvm-tools`, but not
`llvm-tools-preview`, thereby making this change necessary.
This commit changes the shebang in all shell scripts from absolute
paths (such as `/bin/bash` or `/usr/bin/python3`) to the `/usr/bin/env`
binary with the accompanying interpreter as it's argument.
The reason for this are as follows:
- NixOS cannot work with absolute paths
- BSD systems install their packages in /usr/local/bin
As per #309
Update all references. There is one remaining hit for
git-grep '\.sh\b'
namely "build.sh" in maint/reproducible_build, which I think is
the build script for osxcross - ie, an external project.