Update internal MUNT to version 2.7.0

src/sound/munt/FileStream.cpp

@@ -1,5 +1,5 @@
 /* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
- * Copyright (C) 2011-2020 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
+ * Copyright (C) 2011-2022 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU Lesser General Public License as published by
@@ -15,8 +15,8 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifdef MT32EMU_SHARED
-#include <locale>
+#if defined MT32EMU_SHARED && defined MT32EMU_INSTALL_DEFAULT_LOCALE
+#include <clocale>
 #endif
 
 #include "internals.h"
@@ -25,13 +25,18 @@
 
 namespace MT32Emu {
 
+// This initialises C locale with the user-preferred system locale once facilitating access
+// to ROM files with localised pathnames. This is only necessary in rare cases e.g. when building
+// shared library statically linked with C runtime with old MS VC versions, so that the C locale
+// set by the client application does not have effect, and thus such ROM files cannot be opened.
 static inline void configureSystemLocale() {
-#ifdef MT32EMU_SHARED
+#if defined MT32EMU_SHARED && defined MT32EMU_INSTALL_DEFAULT_LOCALE
 	static bool configured = false;
 
 	if (configured) return;
 	configured = true;
-	std::locale::global(std::locale(""));
+
+	setlocale(LC_ALL, "");
 #endif
 }