Issue #3080: Remove unused argument of _PyImport_GetDynLoadFunc()

The first argument, fqname, was not used.
diff --git a/Python/dynload_shlib.c b/Python/dynload_shlib.c
index 7ea510e..1c215c3 100644
--- a/Python/dynload_shlib.c
+++ b/Python/dynload_shlib.c
@@ -75,7 +75,7 @@
 static int nhandles = 0;
 
 
-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;