Problem running scripts from a share with latest snapshot

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

With the latest snapshot, something seems to have changed which stops me 
running scripts by pathname from a samba share.

jon@tambora ~
$ mount
C:/cygwin64/bin on /usr/bin type ntfs (binary,auto)
C:/cygwin64/lib on /usr/lib type ntfs (binary,auto)
//necker/jon on /home/jon type smbfs (binary,exec,noacl,dos)
C:/cygwin64 on / type ntfs (binary,auto)
C: on /cygdrive/c type ntfs (binary,posix=0,user,noumount,auto)

jon@tambora ~
$ uname -a
CYGWIN_NT-6.3 tambora 1.7.30s(0.272/5/3) 20140426 17:41:38 x86_64 Cygwin

jon@tambora ~
$ cat t.sh
#!/bin/sh
echo foo

jon@tambora ~
$ ls -al t.sh
-rwxr-xr-x 1 jon None 20 Apr 28 13:07 t.sh

jon@tambora ~
$ ./t.sh
foo

jon@tambora ~
$ ls -al //necker/jon/t.sh
-rwxrwxrwx 1 Unknown+User Unknown+Group 20 Apr 28 13:07 //necker/jon/t.sh

jon@tambora ~
$ //necker/jon/t.sh
-bash: //necker/jon/t.sh: Permission denied

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