enable IDN by default

Now that `getaddrinfo()` and `getnameinfo()` are being relied upon for
IDN, we can enable it.

Author: Pavel Šimerda

Makefile

@@ -25,8 +25,8 @@ LDFLAG_RT=-lrt
 USE_CAP=yes
 # sysfs support (with libsysfs - deprecated) [no|yes|static]
 USE_SYSFS=no
-# IDN support (experimental) [no|yes|static]
-USE_IDN=no
+# IDN support  [yes|no|static]
+USE_IDN=yes
 
 # Do not use getifaddrs [no|yes|static]
 WITHOUT_IFADDRS=no