Further speedups to icu compilation, it is faster to run the
pre-generated configure scripts.
Ensure that the native protobuf installation only generates the required
libraries and binaries.
Disable qt compilation when running travis on windows. Qt is used for
lrelease, the travis recipe instead usese the a local installation of
lrelease.
Remove various packages and options from the travis recipe.
Update Readline to version 8.0. The previously used url 404'd sometimes,
use the official gnu ftp server instead.
Remove unused cmake config.
Add readline, ldns, graphviz, unbound to depends packages
Add a cmake toolchain file to depends that is uniquely created for every build and placed in triple/share/toolchain.cmake
This file is then passed to cmake with -DCMAKE_TOOLCHAIN_FILE=/path/to/triple/share/toolchain.cmake
Add the boost locale package to depends
In the depends cmake toolchain file, a DEPENDS flag is added
to exclude, or change cmake checks done that are required for depends
Link miniupnpc and unwind from depends and not external
Add libiconv and icu4c to depends, required for mingw32 builds.
Headers (winsock) need to be lower case in order to compile on unix systems.
This should not affect building on windows.
Depends cross compiles project dependencies for linux, mac and windows and multiple architectures.
Depends is original work by Cory Fields and used in bitcoin and a wide range of bitcoin related projects.
