iwpan: use autoconf version defines

This patch use the autoconf VERSION defines instead hardcoded version
strings.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
configure: fix CFLAGS definition

This patch fix the CFLAGS definition from my_CFLAGS to
WPAN_TOOLS_CFLAGS.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
configure: change archive generation

This patch changes the archive generation for "make distcheck".

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
configure: version bump

Bump version for release 0.3

Signed-off-by: Alexander Aring <alex.aring@gmail.com>