Add FUSE_FILL_DIR_DEFAULTS enum (#903)

In order to use the fuse_fill_dir_t function in a C++ program, add the enum item:
FUSE_FILL_DIR_DEFAULTS

Without this change g++ compilation failed with
example/hello.c:94:35: error: invalid conversion from ‘int’ to ‘fuse_fill_dir_flags’ [-fpermissive]
   94 |         filler(buf, ".", NULL, 0, 0);
      |                                   ^
      |                                   |
      |                                   int

1 files changed, 2 insertions, 0 deletions

diff --git a/include/fuse.h b/include/fuse.h
index f0c6f10..90ee4bb 100644
--- a/include/fuse.h
+++ b/include/fuse.h
@@ -48,6 +48,7 @@ enum fuse_readdir_flags {
 	 * FUSE_FILL_DIR_FLAGS for the filler function.  The filesystem may also
 	 * just ignore this flag completely.
 	 */
+	FUSE_READDIR_DEFAULTS = 0,
 	FUSE_READDIR_PLUS = (1 << 0)
 };
 
@@ -64,6 +65,7 @@ enum fuse_fill_dir_flags {
 	 * It is okay to set FUSE_FILL_DIR_PLUS if FUSE_READDIR_PLUS is not set
 	 * and vice versa.
 	 */
+	FUSE_FILL_DIR_DEFAULTS = 0,
 	FUSE_FILL_DIR_PLUS = (1 << 1)
 };