Log Message:
Update to 2.2. Set LICENSE.

Version 2.2 (released 2009-05-20)
- Change how the ASN1_API decorator is used in libtasn1.h, for GTK-DOC.
- Changed license of libtasn1.pc from GPLv3+ to LGPLv2.1+.
  Reported by Jeff Cai <Jeff.Cai@Sun.COM>.
- Building with many warning flags now requires --enable-gcc-warnings.
- Some warnings fixed.