patch 7.4.1065
Problem:    Cannot use the "dll" options on MS-Windows.
Solution:   Support the options on all platforms.  Use the built-in name as
            the default, so that it's clear what Vim is looking for.
diff --git a/src/if_python3.c b/src/if_python3.c
index 387b811..a78fa6b 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -686,12 +686,7 @@
     int
 python3_enabled(int verbose)
 {
-#ifdef WIN3264
-    char *dll = DYNAMIC_PYTHON3_DLL;
-#else
-    char *dll = *p_py3dll ? (char *)p_py3dll : DYNAMIC_PYTHON3_DLL;
-#endif
-    return py3_runtime_link_init(dll, verbose) == OK;
+    return py3_runtime_link_init((char *)p_py3dll, verbose) == OK;
 }
 
 /* Load the standard Python exceptions - don't import the symbols from the