patch 7.4.907
Problem:    Libraries for dynamically loading interfaces can only be defined
            at compile time.
Solution:   Add options to specify the dll names. (Kazuki Sakamoto,
            closes #452)
diff --git a/src/if_python.c b/src/if_python.c
index 2ef0dfc..9d28df0 100644
--- a/src/if_python.c
+++ b/src/if_python.c
@@ -732,7 +732,12 @@
     int
 python_enabled(int verbose)
 {
-    return python_runtime_link_init(DYNAMIC_PYTHON_DLL, verbose) == OK;
+#ifdef WIN3264
+    char *dll = DYNAMIC_PYTHON_DLL;
+#else
+    char *dll = *p_pydll ? (char *)p_pydll : DYNAMIC_PYTHON_DLL;
+#endif
+    return python_runtime_link_init(dll, verbose) == OK;
 }
 
 /*