Move S: libidn2 to the -misc package

Move S: libidn2 to the -misc package

'Suggests' are handled exactly like 'Requires' for package installation
ordering causing dependency loops which break installation order for
whole package sets. We cannot use 'Suggests' where it causes a
dependency loop and libidn2 requires glibc.

Putting the Suggest on glibc-misc makes it active for many system while
not creating the loop.