Issue #3080: Remove unused argument of _PyImport_GetDynLoadFunc()

The first argument, fqname, was not used.
diff --git a/Python/dynload_win.c b/Python/dynload_win.c
index 73a1dcf..9c04250 100644
--- a/Python/dynload_win.c
+++ b/Python/dynload_win.c
@@ -171,7 +171,7 @@
     return NULL;
 }
 
-dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
+dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
                                     const char *pathname, FILE *fp)
 {
     dl_funcptr p;