Revert "[libc][bazel] Support generating public libc headers in Bazel builds. (llvm#141256)" (llvm#143001)

This reverts commit 27143f2. It causes
some downstream failures when bootstrapping builds.

Author: rupprecht

utils/bazel/WORKSPACE

@@ -182,15 +182,6 @@ maybe(
     url = "https://github.com/wjakob/nanobind/archive/refs/tags/v2.4.0.tar.gz",
 )
 
-maybe(
-    http_archive,
-    name = "pyyaml",
-    build_file = "@llvm-raw//utils/bazel/third_party_build:pyyaml.BUILD",
-    sha256 = "f0a35d7f282a6d6b1a4f3f3965ef5c124e30ed27a0088efb97c0977268fd671f",
-    strip_prefix = "pyyaml-5.1/lib3",
-    url = "https://github.com/yaml/pyyaml/archive/refs/tags/5.1.zip",
-)
-
 load("@rules_python//python:repositories.bzl", "py_repositories", "python_register_toolchains")
 
 py_repositories()

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -9,7 +9,6 @@ load("@rules_python//python:defs.bzl", "py_binary")
 load(
     ":libc_build_rules.bzl",
     "libc_function",
-    "libc_generated_header",
     "libc_header_library",
     "libc_math_function",
     "libc_support_library",
@@ -89,14 +88,6 @@ py_binary(
     srcs = glob(["utils/hdrgen/hdrgen/**/*.py"]),
     imports = ["utils/hdrgen"],
     main = "utils/hdrgen/hdrgen/main.py",
-    deps = ["@pyyaml//:yaml"],
-)
-
-libc_generated_header(
-    name = "include_stdbit_h",
-    hdr = "include/stdbit.h",
-    other_srcs = ["include/stdbit.h.def"],
-    yaml_template = "include/stdbit.yaml",
 )
 
 # Library containing all headers that can be transitively included by generated llvm-libc

utils/bazel/llvm-project-overlay/libc/libc_build_rules.bzl

@@ -248,29 +248,6 @@ def libc_header_library(name, hdrs, deps = [], **kwargs):
         **kwargs
     )
 
-def libc_generated_header(name, hdr, yaml_template, other_srcs = []):
-    """Generates a libc header file from YAML template.
-
-    Args:
-      name: Name of the genrule target.
-      hdr: Path of the header file to generate.
-      yaml_template: Path of the YAML template file.
-      other_srcs: Other files required to generate the header, if any.
-    """
-    hdrgen = "//libc:hdrgen"
-    cmd = "$(location {hdrgen}) $(location {yaml}) -o $@".format(
-        hdrgen = hdrgen,
-        yaml = yaml_template,
-    )
-
-    native.genrule(
-        name = name,
-        outs = [hdr],
-        srcs = [yaml_template] + other_srcs,
-        cmd = cmd,
-        tools = [hdrgen],
-    )
-
 def libc_math_function(
         name,
         additional_deps = None):