Fix build

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/plugin/CarlaPluginFluidSynth.cpp

@@ -1,6 +1,6 @@
 /*
  * Carla FluidSynth Plugin
- * Copyright (C) 2011-2019 Filipe Coelho <falktx@falktx.com>
+ * Copyright (C) 2011-2020 Filipe Coelho <falktx@falktx.com>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
@@ -1913,6 +1913,7 @@ CarlaPlugin* CarlaPlugin::newFluidSynth(const Initializer& init, PluginType ptyp
     return nullptr;
 
     // unused
+    (void)ptype;
     (void)use16Outs;
 #endif
 }

source/utils/CarlaScopeUtils.hpp

@@ -29,6 +29,10 @@
 # define CARLA_USE_NEWLOCALE
 #endif
 
+#if defined(CARLA_OS_WIN) && __MINGW64_VERSION_MAJOR >= 5
+# define CARLA_USE_CONFIGTHREADLOCALE
+#endif
+
 // -----------------------------------------------------------------------
 // CarlaScopedEnvVar class
 
@@ -103,7 +107,7 @@ public:
         : newloc(::newlocale(LC_NUMERIC_MASK, "C", kNullLocale)),
           oldloc(newloc != kNullLocale ? ::uselocale(newloc) : kNullLocale) {}
 #else
-# ifdef CARLA_OS_WIN
+# ifdef CARLA_USE_CONFIGTHREADLOCALE
         : oldthreadloc(_configthreadlocale(_ENABLE_PER_THREAD_LOCALE)),
 # else
         : oldthreadloc(-1),
@@ -128,7 +132,7 @@ public:
             delete[] oldloc;
         }
 
-# ifdef CARLA_OS_WIN
+# ifdef CARLA_USE_CONFIGTHREADLOCALE
         if (oldthreadloc != -1)
             _configthreadlocale(oldthreadloc);
 # endif