[BUGS] ipcclean broken on OSX

[Neil Conway]

Using a fresh checkout from CVS HEAD, I get the following on my machine:

% ipcclean --version
/Users/neilc/local/pgsql-cvs/bin/ipcclean: line 114: ipcs: command not 
found

This machine is running a pretty standard install of OSX 10.3.3.

At the very least, we shouldn't bother installing ipcclean if it is 
totally non-functional on this platform.

-Neil

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