build: silence mingw fpic warning spew
build: Find the proper xcb/pcre dependencies
build: teach macdeploy the -translations-dir argument, for use with static qt

When QT is linked statically, macdeploy can't infer its paths. While plugins
and frameworks don't need to be packaged, translations still do (for now).
build: add --with-qt-translationdir to configure for use with static qt
build: hook up qt translations for static osx packaging
build: Fix 'make deploy' when binaries haven't been built yet
build: fix race in 'make deploy' for windows

The binary builds can clobber eachother, so use a single subdir dependency
instead.
travis: add WIP dependency builder.
travis: initial config
gitian: replace descriptors