Expose distutils errors

As mentioned in #2698, exposing distutil errors via setuptools help the
migration stated by PEP 632.

Author: abravalheri

changelog.d/2698.change.rst

@@ -0,0 +1 @@
+Exposed exception classes from ``distutils.errors`` via ``setuptools.errors``.

setuptools/errors.py

@@ -3,6 +3,7 @@
 Provides exceptions used by setuptools modules.
 """
 
+from distutils import errors as _distutils_errors
 from distutils.errors import DistutilsError
 
 
@@ -14,3 +15,26 @@ class RemovedCommandError(DistutilsError, RuntimeError):
     error is raised if a command exists in ``distutils`` but has been actively
     removed in ``setuptools``.
     """
+
+
+# Re-export errors from distutils to facilitate the migration to PEP632
+
+ByteCompileError = _distutils_errors.DistutilsByteCompileError
+CCompilerError = _distutils_errors.CCompilerError
+ClassError = _distutils_errors.DistutilsClassError
+CompileError = _distutils_errors.CompileError
+ExecError = _distutils_errors.DistutilsExecError
+FileError = _distutils_errors.DistutilsFileError
+InternalError = _distutils_errors.DistutilsInternalError
+LibError = _distutils_errors.LibError
+LinkError = _distutils_errors.LinkError
+ModuleError = _distutils_errors.DistutilsModuleError
+OptionError = _distutils_errors.DistutilsOptionError
+PlatformError = _distutils_errors.DistutilsPlatformError
+PreprocessError = _distutils_errors.PreprocessError
+SetupError = _distutils_errors.DistutilsSetupError
+TemplateError = _distutils_errors.DistutilsTemplateError
+UnknownFileError = _distutils_errors.UnknownFileError
+
+# The root error class in the hierarchy
+BaseError = _distutils_errors.DistutilsError