Removed excessive #ifdef __QNX__ blocks.

wrapper... so just use fcntl() locks.  Also, if it is flat out impossible
for anyone to ever get a lock on a particular file (ie: is a socket) do not
fail.

Note: This trick may come in hady for a future locking solution.

brokenest under QNX.

Add more locking tests to wraptest.c

fcntl).
lock/unlock/sopen for Unix now use both lockf and fcntl mechanisms
Replaced C++ comments with C comments.

Will replace smbwrap.* at some point.

(lock is now smart enough to apply the correct lock-type based on open flags).

lock() for Unix now sets the appropriate lock type (shareable or exclusive) based on how the file was initially opened.

Eliminated unnecessary setting of flock.l_pid (only used on F_GETLK).

Moved stlupr() too just because they seem to go well together. :-)
Added  export macros to Unix prototypes in smbwrap.h in preperation for importing from shared object.