eliminate stderr usage in std.Build make() functions

* Eliminate all uses of `std.debug.print` in make() functions, instead
  properly using the step failure reporting mechanism.
* Introduce the concept of skipped build steps. These do not cause the
  build to fail, and they do allow their dependants to run.
* RunStep gains a new flag, `skip_foreign_checks` which causes the
  RunStep to be skipped if stdio mode is `check` and the binary cannot
  be executed due to it being a foreign executable.
  - RunStep is improved to automatically use known interpreters to
    execute binaries if possible (integrating with flags such as
    -fqemu and -fwasmtime). It only does this after attempting a native
    execution and receiving a "exec file format" error.
  - Update RunStep to use an ArrayList for the checks rather than this
    ad-hoc reallocation/copying mechanism.
  - `expectStdOutEqual` now also implicitly adds an exit_code==0 check
    if there is not already an expected termination. This matches
    previously expected behavior from older API and can be overridden by
    directly setting the checks array.
* Add `dest_sub_path` to `InstallArtifactStep` which allows choosing an
  arbitrary subdirectory relative to the prefix, as well as overriding
  the basename.
  - Delete the custom InstallWithRename step that I found deep in the
    test/ directory.
* WriteFileStep will now update its step display name after the first
  file is added.
* Add missing stdout checks to various standalone test case build
  scripts.

lib/std/Build/ObjCopyStep.zig

@@ -95,8 +95,7 @@ fn make(step: *Step, prog_node: *std.Progress.Node) !void {
     const full_dest_path = try b.cache_root.join(b.allocator, &.{ "o", &digest, self.basename });
     const cache_path = "o" ++ fs.path.sep_str ++ digest;
     b.cache_root.handle.makePath(cache_path) catch |err| {
-        std.debug.print("unable to make path {s}: {s}\n", .{ cache_path, @errorName(err) });
-        return err;
+        return step.fail("unable to make path {s}: {s}", .{ cache_path, @errorName(err) });
     };
 
     var argv = std.ArrayList([]const u8).init(b.allocator);