Modernize configure.ac
    * configure.ac: Fix parameters in AC_INIT, AM_INIT_AUTOMAKE.
Added generating missing files.
    autogen.sh failed with error: required file './compile' not found.

    * autogen.sh: Added --add-missing parameter to automake.
Fix old macro.
    INCLUDES macro is old.

    * assuan/Makefile.am: changed to AM_CPPFLAGS.
NEWS updated.
    * NEWS: added autogen fixes message.
Merge pull request #2 from serge-v/autoconf

Fix build scripts.