self-hosted libc detection

 * libc_installation.cpp is deleted.
   src-self-hosted/libc_installation.zig is now used for both stage1 and
   stage2 compilers.
 * (breaking) move `std.fs.File.access` to `std.fs.Dir.access`. The API
   now encourages use with an open directory handle.
 * Add `std.os.faccessat` and related functions.
 * Deprecate the "C" suffix naming convention for null-terminated
   parameters. "C" should be used when it is related to libc. However
   null-terminated parameters often have to do with the native system
   ABI rather than libc. "Z" suffix is the new convention. For example,
   `std.os.openC` is deprecated in favor of `std.os.openZ`.
 * Add `std.mem.dupeZ` for using an allocator to copy memory and add a
   null terminator.
 * Remove dead struct field `std.ChildProcess.llnode`.
 * Introduce `std.event.Batch`. This API allows expressing concurrency
   without forcing code to be async. It requires no Allocator and does
   not introduce any failure conditions. However it is not thread-safe.
 * There is now an ongoing experiment to transition away from
   `std.event.Group` in favor of `std.event.Batch`.
 * `std.os.execvpeC` calls `getenvZ` rather than `getenv`. This is
   slightly more efficient on most systems, and works around a
   limitation of `getenv` lack of integration with libc.
 * (breaking) `std.os.AccessError` gains `FileBusy`, `SymLinkLoop`, and
   `ReadOnlyFileSystem`. Previously these error codes were all reported
   as `PermissionDenied`.
 * Add `std.Target.isDragonFlyBSD`.
 * stage2: access to the windows_sdk functions is done with a manually
   maintained .zig binding file instead of `@cImport`.
 * Update src-self-hosted/libc_installation.zig with all the
   improvements that stage1 has seen to src/libc_installation.cpp until
   now. In addition, it now takes advantage of Batch so that evented I/O
   mode takes advantage of concurrency, but it still works in blocking
   I/O mode, which is how it is used in stage1.

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