Create the temporary directory within DATADIR, to ensure they're created
on the same device as their destination.

While here, use USES=autoreconf, and remove the @dirrm.

PR:		194086
Submitted by:	Yasuhito FUTATSUKI


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370750 35697150-7ecd-e111-bb59-0022644237b5