fs/NarrowPath: un-inline Windows constructor

src/fs/NarrowPath.cxx

+/*
+ * Copyright 2003-2018 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "NarrowPath.hxx"
+
+#ifdef _UNICODE
+
+#include "lib/icu/Win32.hxx"
+
+#include <windows.h>
+
+NarrowPath::NarrowPath(Path _path) noexcept
+	:value(WideCharToMultiByte(CP_ACP, _path.c_str()))
+{
+	if (value.IsNull())
+		/* fall back to empty string */
+		value = Value::Empty();
+}
+
+#endif /* _UNICODE */

src/fs/NarrowPath.hxx

@@ -21,12 +21,9 @@
 #define MPD_FS_NARROW_PATH_HXX
 
 #include "Path.hxx"
-#include "util/Macros.hxx"
 
 #ifdef _UNICODE
-#include "lib/icu/Win32.hxx"
 #include "util/AllocatedString.hxx"
-#include <windows.h>
 #else
 #include "util/StringPointer.hxx"
 #endif
@@ -48,12 +45,7 @@ class NarrowPath {
 
 public:
 #ifdef _UNICODE
-	explicit NarrowPath(Path _path)
-		:value(WideCharToMultiByte(CP_ACP, _path.c_str())) {
-		if (value.IsNull())
-			/* fall back to empty string */
-			value = Value::Empty();
-	}
+	explicit NarrowPath(Path _path) noexcept;
 #else
 	explicit NarrowPath(Path _path):value(_path.c_str()) {}
 #endif

src/fs/meson.build

@@ -6,6 +6,7 @@ fs_sources = [
   'Path.cxx',
   'Path2.cxx',
   'AllocatedPath.cxx',
+  'NarrowPath.cxx',
   'FileSystem.cxx',
   'List.cxx',
   'StandardDirectory.cxx',