Log Message:
Import p5-Net-LibIDN version 0.11.

Adapted from submission in PR#39542.

Adds a patch to portably pull in $Config{ldflags} to avoid run-path
lossage which would otherwise ensue.

Provides bindings for GNU Libidn, a C library for handling Internationalized
Domain Names according to IDNA (RFC 3490), in a way very much inspired by
Turbo Fredriksson's PHP-IDN.