libidn: upgrade to 0.6.14(GPLv2), and 1.19 (GPLv3)
libidn changed to GPLv3 since 2007 (its 1.0 release), so this upgrade includes two:
0.6.14 (GPLv2):
- change SRC_URI as original doesn't work
- remove original do_configure_prepend, which doesn't make any sense when inheriting
autotools
- this version includes a local copy of AC_USE_SYSTEM_EXTENSIONS which conflicts with
latest autoconf. Actually it's not necessary and remove all references to local version
1.19 (GPLv3):
- split a new package 'idn' for command line tools, which are licensed under GPLv3.
keep other bits in libidn licensed under LGPLv2.1
