Set correct preprocessor condition for when the content of file src/scandir_posix.c is necessary.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11603 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/scandir_posix.c

@@ -33,6 +33,8 @@
  */
 
 #include <config.h>
+#if defined(USE_X11) && !defined(HAVE_SCANDIR)
+
 #ifndef HAVE_PTHREAD
    /* Switch system headers into POSIX.1-1990 mode */
 #  define _POSIX_SOURCE
@@ -201,6 +203,8 @@ fl_scandir(const char *dir, struct dirent ***namelist,
   return result;
 }
 
+#endif // defined(USE_X11) && !defined(HAVE_SCANDIR)
+
 /*
  * End of "$Id$".
  */