Work around setuptools issue sqlalchemy#1902

Added a workaround for a setuptools-related failure that has been observed
as occurring on Windows installations, where setuptools is not correctly
reporting a build error when the MSVC build dependencies are not installed
and therefore not allowing graceful degradation into non C extensions
builds.

Setuptools issue pypa/setuptools#1902

Fixes: sqlalchemy#4967
Change-Id: I5e21e7e78cb6d927b18afce64cacf8643b98354e

doc/build/changelog/unreleased_13/4967.rst

@@ -0,0 +1,9 @@
+.. change::
+    :tags: bug, installation, windows
+    :tickets: 4967
+
+    Added a workaround for a setuptools-related failure that has been observed
+    as occurring on Windows installations, where setuptools is not correctly
+    reporting a build error when the MSVC build dependencies are not installed
+    and therefore not allowing graceful degradation into non C extensions
+    builds.

setup.py

@@ -38,7 +38,8 @@
 if sys.platform == "win32":
     # 2.6's distutils.msvc9compiler can raise an IOError when failing to
     # find the compiler
-    ext_errors += (IOError,)
+    # for TypeError, see https://github.com/pypa/setuptools/issues/1902
+    ext_errors += (IOError, TypeError)
 
 
 class BuildFailed(Exception):