Restore access to _get_vc_env with a warning.

Fixes #4874

Author: jaraco

distutils/_msvccompiler.py

@@ -1,5 +1,16 @@
+import warnings
+
 from .compilers.C import msvc
 
 __all__ = ["MSVCCompiler"]
 
 MSVCCompiler = msvc.Compiler
+
+
+def __getattr__(name):
+    if name == '_get_vc_env':
+        warnings.warn(
+            "_get_vc_env is private; find an alternative (pypa/distutils#340)"
+        )
+        return msvc._get_vc_env
+    raise AttributeError(name)

newsfragments/4874.feature.rst

@@ -0,0 +1 @@
+Restore access to _get_vc_env with a warning.