Fix spelling.

src/libvlc-module.c

@@ -346,7 +346,7 @@ static const char *const ppsz_force_dolby_descriptions[] = {
     "Protect against sound clipping" )
 
 #define AUDIO_TIME_STRETCH_TEXT N_( \
-    "Enable time streching audio" )
+    "Enable time stretching audio" )
 #define AUDIO_TIME_STRETCH_LONGTEXT N_( \
     "This allows to play audio at lower or higher speed without " \
     "affecting the audio pitch" )