std.Build.Step.ConfigHeader: Add support for Autoconf `@FOO@` variables
Add the new style `Style.autoconf_at`. Rename the existing
`Style.autoconf` (which uses `#undef` directives) to
`Style.autoconf_undef`.
62e388e73eConstantin Bilz committed on 2/21/2025, 2:22:39 PMparent05d8b56