[thrift] Output dir selection + updated TSCons

Summary: Allows setting the output directory via the new '-o dir' cmdline option.

  TSCons is updated to use this to put the output in the right place no matter
  the cwd, so doing dependent builds from different directories won't break.

Reviewed By: martin
Test Plan: mkdir /tmp/honk; thrift -cpp -java -javabean -php -phpi -py -rb -xsd -perl -erl -ocaml -hs -cocoa -o /tmp/honk Tablet.thrift
Revert: svn


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665311 13f79535-47bb-0310-9956-ffa450edef68
26 files changed