Work around incorrect g_file_test() behavior on Win32

g_file_test is redefined to be g_file_test_utf8 and thus can't handle
non-ASCII characters. This fix adds simple wrapper (taken from glib)
that fixes encoding and calls g_file_test_utf8. All required inclusions
of glib_compat.h are added as well.

NEWS

@@ -1,6 +1,7 @@
 ver 0.16.9 (2012/??/??)
 * decoder:
   - ffmpeg: support WebM
+* WIN32: fix renaming of stored playlists with non-ASCII names
 
 
 ver 0.16.8 (2012/04/04)

src/cmdline.c

@@ -27,6 +27,7 @@
 #include "output_list.h"
 #include "ls.h"
 #include "mpd_error.h"
+#include "glib_compat.h"
 
 #ifdef ENABLE_ENCODER
 #include "encoder_list.h"

src/decoder/wildmidi_decoder_plugin.c

@@ -19,6 +19,7 @@
 
 #include "config.h"
 #include "decoder_api.h"
+#include "glib_compat.h"
 
 #include <glib.h>
 

src/glib_compat.h

@@ -74,4 +74,32 @@ g_uri_parse_scheme(const char *uri)
 
 #endif
 
+#if defined(G_OS_WIN32) && defined(g_file_test)
+
+/* Modern GLib on Win32 likes to use UTF-8 for file names.
+It redefines g_file_test() to be g_file_test_utf8().
+This gives incorrect results for non-ASCII files.
+Old g_file_test() is available for *binary compatibility*,
+but symbol is hidden from linker, we copy-paste its definition here */
+
+#undef g_file_test
+
+static inline gboolean
+g_file_test(const gchar *filename, GFileTest test)
+{
+	gchar *utf8_filename = g_locale_to_utf8(filename, -1, NULL, NULL, NULL);
+	gboolean retval;
+
+	if (utf8_filename == NULL)
+		return FALSE;
+
+	retval = g_file_test_utf8(utf8_filename, test);
+
+	g_free(utf8_filename);
+
+	return retval;
+}
+
+#endif
+
 #endif

src/playlist_save.c

@@ -26,6 +26,7 @@
 #include "uri.h"
 #include "database.h"
 #include "idle.h"
+#include "glib_compat.h"
 
 #include <glib.h>
 

src/update_walk.c

@@ -29,6 +29,7 @@
 #include "decoder_list.h"
 #include "decoder_plugin.h"
 #include "playlist_list.h"
+#include "glib_compat.h"
 #include "conf.h"
 
 #ifdef ENABLE_ARCHIVE