Clean up the Boost/windows.h trickery

I didn't know NOMINMAX was a thing, but that fixes a lot of compile
errors.

src/wine-host/boost-fix.h

@@ -0,0 +1,47 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+// Libraries like Boost think we're compiling on Windows or using a MSVC
+// toolchain. This will cause them to make incorrect assumptions which platform
+// specific features are available. The only way around this I could think of
+// was to just temporarily undefine the macros these libraries use to detect
+// it's running under a WIN32 environment. If anyone knows a better way to do
+// this, please let me know!
+
+#pragma push_macro("WIN32")
+#pragma push_macro("_WIN32")
+#pragma push_macro("__WIN32__")
+#pragma push_macro("_WIN64")
+
+#undef WIN32
+#undef _WIN32
+#undef __WIN32__
+#undef _WIN64
+
+// This would be the minimal include needed to get Bosot to work. The commented
+// out include below is the actual header that would cause compile errors if not
+// included here, but including headers from the detail directory directly
+// didn't sound like a great idea.
+
+#include <boost/asio/basic_socket_streambuf.hpp>
+// #include <boost/asio/detail/timer_queue_ptime.hpp>
+
+#pragma pop_macro("WIN32")
+#pragma pop_macro("_WIN32")
+#pragma pop_macro("__WIN32__")
+#pragma pop_macro("_WIN64")