Log Message:
Changes 1.22:
* Add -liconv as static library requirement in libidn.pc, for MinGW.
* Fix memory leak in idna_to_ascii_4z when idna_to_ascii_4i fails.
* Ran clang-analyze on the code. Fixed some dead assignments/initializations.
* Really distribute win32/libidn4win.mk.
* API and ABI is backwards compatible with the previous version.