Log Message:
DISTFILE on ftp.sra.co.jp is newer than on ${MASTER_SITE_FREEBSD},
so change MASTER_SITES to only ftp.sra.co.jp and force to use newer one.
As sccsid in source, ${MASTE_SITE_FREEBSD}'s one is 2.2, and sra's one is 2.3,
so bump PKGVERSION to 2.3.
This issue noticed by taca@ by private mail.

While here, set LICENSE=gnu-gpl-v2, modify pach-aa to suppress some
warings by addition of include stdlib.h.