BLD: Define an error function on Cygwin.

DWesl · DWesl · commit 2bea21b2b862 · 2022-05-18T07:36:00.000-04:00
This function is defined on Windows, not Cygwin.
Should maybe request that upstream.
diff --git a/src/_tkagg.cpp b/src/_tkagg.cpp
@@ -24,6 +24,9 @@
  * also.
  */
 #define WIN32_DLL
+static inline PyObject *PyErr_SetFromWindowsErr(int ierr) {
+    return PyErr_SetString(PyExc_OSError, "Call to EnumProcessModules failed");
+}
 #endif
 
 #ifdef WIN32_DLL
