server/srv_samr.c smbd/ipc.c: Changed global_myworkgroup back to fstring

server/srv_samr.c smbd/ipc.c: Changed global_myworkgroup back to fstring
                              (as it is everywhere else).
smbwrapper/smbsh.c: For IRIX n32 binaries, set _RLDN32_LIST not _RLD32_LIST.
                    Exec users preferred shell is SHELL environment variable is set.
tests/fcntl_lock.c: Added sys/types.h for systems that need this.
Jeremy.
(This used to be commit 50413d0d819d4f13e760ca8439c5bdde0898d63e)