win32: do not pretend to implement ftrylockfile()

This is not currently used anywhere in the code base anyway.

compat/flockfile.c

@@ -40,12 +40,6 @@ void flockfile (FILE *stream)
     _lock_file (stream);
 }
 
-int ftrylockfile (FILE *stream)
-{
-    flockfile (stream); /* Move along people, there is nothing to see here. */
-    return 0;
-}
-
 void funlockfile (FILE *stream)
 {
     _unlock_file (stream);

include/vlc_fixups.h

@@ -122,7 +122,6 @@ int asprintf (char **, const char *, ...);
 
 #ifndef HAVE_FLOCKFILE
 void flockfile (FILE *);
-int ftrylockfile (FILE *);
 void funlockfile (FILE *);
 int getc_unlocked (FILE *);
 int getchar_unlocked (void);