fix windows build

Author: jef-n

src/app/main.cpp

@@ -604,11 +604,20 @@ int main( int argc, char *argv[] )
 
         if ( systemEnvVars.contains( envVarName ) && envVarApply == "unset" )
         {
+#ifdef Q_WS_WIN
+          putenv( envVarName.toUtf8().constData() );
+#else
           unsetenv( envVarName.toUtf8().constData() );
+#endif
         }
         else
         {
+#ifdef Q_WS_WIN
+	  if ( envVarApply != "undefined" || !getenv( envVarName.toUtf8().constData() ) )
+            putenv( QString( "%1=%2" ).arg( envVarName ).arg( envVarValue ).toUtf8().constData() );
+#else
           setenv( envVarName.toUtf8().constData(), envVarValue.toUtf8().constData(), envVarApply == "undefined" ? 0 : 1 );
+#endif
         }
       }
     }