Add a workaround for compilation with Wine 5.7+

CHANGELOG.md

@@ -14,6 +14,11 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   initialization process without telling the host. This fixes the Roland Cloud
   plugins.
 
+### Fixed
+
+- Added a workaround for the compilation issues under Wine 5.7 and above as
+  caused by [Wine bug 49138](https://bugs.winehq.org/show_bug.cgi?id=49138).
+
 ## [1.1.2] - 2020-05-09
 
 ### Fixed

README.md

@@ -204,13 +204,10 @@ To compile yabridge, you'll need [Meson](https://mesonbuild.com/index.html) and
 the following dependencies:
 
 - gcc (tested using GCC 9.2)
-- A Wine installation with `winegcc` and the development headers. At the moment
-  there's a regression in **Wine 5.7+** causing compiled winelib applications to
-  break. I've created an issue for this on WineHQ's [bug
-  tracker](https://bugs.winehq.org/show_bug.cgi?id=49138). You'll have to
-  temporarily downgrade to an earlier version of Wine if you've got Wine 5.7
-  installed and you're trying to compile yabridge.
-- Boost
+- A Wine installation with `winegcc` and the development headers. The latest
+  commits contain a workaround for a winelib [compilation
+  issue](https://bugs.winehq.org/show_bug.cgi?id=49138) with Wine 5.7+.
+- Boost with at least `libboost_filesystem.a`
 - xcb
 
 The following dependencies are included in the repository as a Meson wrap:

src/wine-host/vst-host.cpp

@@ -22,7 +22,10 @@
 
 #include "wine-bridge.h"
 
-int main(int argc, char* argv[]) {
+// This explicit calling convention is needed to work around a bug introduced in
+// Wine 5.7
+// https://bugs.winehq.org/show_bug.cgi?id=49138
+int __cdecl main(int argc, char* argv[]) {
     // We pass the name of the VST plugin .dll file to load and the Unix domain
     // socket to connect to in plugin/bridge.cpp as the first two arguments of
     // this process.