meson: codec: fix extra lib prefix

The meson target was named 'libvlc_vtutils' but meson automatically
adds a 'lib' prefix, producing 'liblibvlc_vtutils.a'. Rename the target
to 'vlc_vtutils' so the output match the intended name.

modules/codec/meson.build

@@ -524,7 +524,7 @@ vlc_modules += {
 # TODO: Set proper flags for minimum iOS/tvOS versions
 if host_system == 'darwin'
 
-    libvlc_vtutils = static_library('libvlc_vtutils',
+    libvlc_vtutils = static_library('vlc_vtutils',
         files('vt_utils.c', 'vt_utils.h'),
         include_directories : vlc_include_dirs,
         dependencies : [corevideo_dep])