Fix plugin host watchdog treating zombies as alive

src/plugin/host-process.cpp

@@ -96,11 +96,10 @@ fs::path IndividualHost::path() {
     return host_path;
 }
 
-bool IndividualHost::running() noexcept {
-    std::error_code error{};
-    const bool running = host.running(error);
-
-    return running && !error;
+bool IndividualHost::running() {
+    // NOTE: `boost::process::child::running()` still considers zombies as
+    //       running, so it's useless for our purposes.
+    return pid_running(host.id());
 }
 
 void IndividualHost::terminate() {

src/plugin/host-process.h

@@ -52,7 +52,7 @@ class HostProcess {
      * Return true if the host process is still running. Used during startup to
      * abort connecting to sockets if the Wine process has crashed.
      */
-    virtual bool running() noexcept = 0;
+    virtual bool running() = 0;
 
     /**
      * Kill the process or cause the plugin that's being hosted to exit.
@@ -200,7 +200,7 @@ class IndividualHost : public HostProcess {
                    const HostRequest& host_request);
 
     boost::filesystem::path path() override;
-    bool running() noexcept override;
+    bool running() override;
     void terminate() override;
 
    private: