Remove conditional logic for unsupported setuptools versions

Author: oschwald

setup.py

@@ -5,20 +5,7 @@
 from setuptools import Extension, setup
 from setuptools.command.bdist_wheel import bdist_wheel
 from setuptools.command.build_ext import build_ext
-
-# These were only added to setuptools in 59.0.1.
-try:
-    from setuptools.errors import (
-        CCompilerError,
-        DistutilsExecError,
-        DistutilsPlatformError,
-    )
-except ImportError:
-    from distutils.errors import (
-        CCompilerError,
-        DistutilsExecError,
-        DistutilsPlatformError,
-    )
+from setuptools.errors import CCompilerError, ExecError, PlatformError
 
 cmdclass = {}
 PYPY = hasattr(sys, "pypy_version_info")
@@ -74,7 +61,7 @@
 
 # Cargo cult code for installing extension with pure Python fallback.
 # Taken from SQLAlchemy, but this same basic code exists in many modules.
-ext_errors = (CCompilerError, DistutilsExecError, DistutilsPlatformError)
+ext_errors = (CCompilerError, ExecError, PlatformError)
 
 
 class BuildFailed(Exception):
@@ -88,7 +75,7 @@ class ve_build_ext(build_ext):
     def run(self) -> None:
         try:
             build_ext.run(self)
-        except DistutilsPlatformError:
+        except PlatformError:
             raise BuildFailed
 
     def build_extension(self, ext) -> None: