globstar fails to resolve symlink

[McDutchie]

$ set -G                                                                                                                             
$ mkdir -p test/dir/d{1,2,3,4,5}/foo/bar
$ touch test/dir/d{1,2,3,4,5}/foo/bar/testfile
$ ls -l test/**/testfile   # output OK:
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 test/dir/d1/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 test/dir/d2/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 test/dir/d3/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 test/dir/d4/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 test/dir/d5/foo/bar/testfile
$ ln -s test link
$ ls -l link/**/testfile   # BUG:
ls: link/**/testfile: No such file or directory
$ ls -l link//**/testfile  # double slash is workaround:
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 link//dir/d1/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 link//dir/d2/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 link//dir/d3/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 link//dir/d4/foo/bar/testfile
-rw-r--r--  1 martijn  staff  0  8 apr 00:27 link//dir/d5/foo/bar/testfile

[McDutchie]

Apparently, the fix in aad7459 was incomplete: it fixed symlink/** but not symlink/**/foo.