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.

1 files changed, 1 insertions, 2 deletions

diff --git a/build.zig b/build.zig
index 5f7e214d35..d32f666dac 100644
--- a/build.zig
+++ b/build.zig
@@ -385,7 +385,7 @@ pub fn build(b: *std.Build) !void {
     const optimization_modes = chosen_opt_modes_buf[0..chosen_mode_index];
 
     const fmt_include_paths = &.{ "doc", "lib", "src", "test", "tools", "build.zig" };
-    const fmt_exclude_paths = &.{ "test/cases" };
+    const fmt_exclude_paths = &.{"test/cases"};
     const check_fmt = b.addFmt(.{
         .paths = fmt_include_paths,
         .exclude_paths = fmt_exclude_paths,
@@ -402,7 +402,6 @@ pub fn build(b: *std.Build) !void {
     const do_fmt_step = b.step("fmt", "Modify source files in place to have conforming formatting");
     do_fmt_step.dependOn(&do_fmt.step);
 
-
     test_step.dependOn(tests.addPkgTests(
         b,
         test_filter,