Show build logs on console by default, to make build cluster fallouts
investigation easier.

 Add option (default OFF) for old behavior if somebody needs it.

 Bo functional changes, package results are bit-equivalent, so no
PORTREVISION bumps.
RT contains no compiled code, so code equivalent to USES=pgsql --
which adds a LIB_DEPENDS on libpg.so -- and similarly for USES=mysql
and USES=sqlite is actually wrong.  RT will inherit the correct
dependencies from p5-DBD-Pg, p5-DBD-mysql or p5-DBD-Sqlite.
Update to 0.9.11.4.739