Revert "Win32: fix src/ compilation"

This reverts commit 908d0b93.

src/extras/getopt.c

@@ -359,8 +359,6 @@ static const char *
      char *const *argv;
      const char *optstring;
 {
-    (void)argc;
-    (void)argv;
     /* Start processing options with ARGV-element 1 (since ARGV-element 0
        is the program name); the sequence of previously skipped
        non-option ARGV-elements is empty.  */

src/misc/w32thread.c

@@ -373,8 +373,6 @@ void vlc_rwlock_unlock (vlc_rwlock_t *lock)
 int vlc_threadvar_create (vlc_threadvar_t *p_tls, void (*destr) (void *))
 {
 #warning FIXME: use destr() callback and stop leaking!
-    VLC_UNUSED( destr );
-
     *p_tls = TlsAlloc();
     return (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
 }

src/misc/win32_specific.c

@@ -47,7 +47,6 @@
  *****************************************************************************/
 void system_Init( libvlc_int_t *p_this, int *pi_argc, const char *ppsz_argv[] )
 {
-    VLC_UNUSED( p_this ); VLC_UNUSED( pi_argc ); VLC_UNUSED( ppsz_argv );
     WSADATA Data;
 
     /* Get our full path */