bpo-40443: Remove unused imports in distutils (GH-19802)

diff --git a/Lib/distutils/bcppcompiler.py b/Lib/distutils/bcppcompiler.py
index 9f4c432..071fea5 100644
--- a/Lib/distutils/bcppcompiler.py
+++ b/Lib/distutils/bcppcompiler.py
@@ -14,10 +14,10 @@
 
 import os
 from distutils.errors import \
-     DistutilsExecError, DistutilsPlatformError, \
+     DistutilsExecError, \
      CompileError, LibError, LinkError, UnknownFileError
 from distutils.ccompiler import \
-     CCompiler, gen_preprocess_options, gen_lib_options
+     CCompiler, gen_preprocess_options
 from distutils.file_util import write_file
 from distutils.dep_util import newer
 from distutils import log