autotools: set build tools to empty to signify they weren't found
autotools: libprotobuf is always needed for qt
autotools: osx needs OBJCXXFLAGS set for newer autotoools
autotools: create a generic 'deploy' target for windows/osx

Automate the OSX dmg creation process.

This removes the previous win32-deploy target and replaces it with a
generic one for the current platform.
autotools: patch macdeployqtplus to remove the dependency on Python 2.7

This makes it suitable for use with the preinstalled python on OSX 10.6.
autotools: update macdeploy notes
autotools: fixup gitian after 'make deploy' change
autotools: more sed ping/pong. Apparently ,+x is a GNU extension
autotools: update gitignore
autotools: keep bitcoin-qt dependencies out of bitcoind
autotools: fix brew paths, verified working
autotools: fix for building on 10.6 with homebrew
autotools: fix qrencode typo
autotools: fix osx dead code stripping