patch 8.1.0916: with Python 3.7 "find_module" is not made available

Problem:    With Python 3.7 "find_module" is not made available.
Solution:   Also add "find_module" with Python 3.7. (Joel Frederico,
            closes #3954)

src/if_py_both.h

@@ -87,9 +87,9 @@ static PyObject *vim_special_path_object;
 #if PY_VERSION_HEX >= 0x030700f0
 static PyObject *py_find_spec;
 #else
-static PyObject *py_find_module;
 static PyObject *py_load_module;
 #endif
+static PyObject *py_find_module;
 
 static PyObject *VimError;
 
@@ -6921,6 +6921,13 @@ populate_module(PyObject *m)
 	return -1;
     }
 
+    if ((py_find_module = PyObject_GetAttrString(cls, "find_module")))
+    {
+	// find_module() is deprecated, this may stop working in some later
+	// version.
+        ADD_OBJECT(m, "_find_module", py_find_module);
+    }
+
     Py_DECREF(imp);
 
     ADD_OBJECT(m, "_find_spec", py_find_spec);

src/version.c

@@ -783,6 +783,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    916,
 /**/
     915,
 /**/