The version script already maps _idn2* to _idn2*@IDN2_0.0.0.  Do not
create a duplicate entry with .symver that ld.bfd cannot handle.

Index: lib/puny_encode.c
--- lib/puny_encode.c.orig
+++ lib/puny_encode.c
@@ -229,5 +229,4 @@ int punycode_encode(
 __typeof__ (_idn2_punycode_encode_internal) _idn2_punycode_encode
    __attribute__ ((visibility ("default"),
                    alias ("_idn2_punycode_encode_internal")));
-__asm__ (".symver _idn2_punycode_encode, _idn2_punycode_encode@IDN2_0.0.0");
 #endif