This makes sure that shared library built with MinGW toolchain is linked
statically to *all* its dependencies, including libc, libstdc++, libsdl2
and all the others. This allows producing of working `openrct2.dll` by
cross-compiling.

I hit a bug with libcrypto, a dependency of libssl, which in turn is a
dependency of curl, which creates a `DllMain` entrypoint for static lib
too, but since we don't do anything in ours, this should be safe.

I have only had chance to try it out when cross-compiling, ideally it
should be tested under Cygwin/MSYS too, but it is too bothersome to
setup for me.

This is mostly refactoring of cmake scripts, but also touches build.sh
and install.sh. The cmake should be much more palatable now for major
Linux distributions.

At the same time, new configuration is introduced to Linux version, one
with Twitch enabled.

Please note, however, this change requires update of orctlibs.zip for
mingw builds.

It will automatically extract to /usr/local/

The project now uses the MinGW headers instead of wine's headers.

fix syntax

use elif

run it with bash

fix directory incantations

add missing build steps

dont use colors if not terminal

update install.sh

add sanity check

changes

set verbose mode

enable debug output

changes to get it working on mac

Platform specific cmakelists

fix issue with intptr_t not being found/defined

update build scripts

see if it can find the pkg-config

try running it outside of cmake

check whether excho works way we expect

try -e

remove debug info