#138 Remove ambiguity for callback_chain in AIX

[John Robb]

The callback_chain structures in many of the lib files
share the same name but have different fields. For the
linux builds, NEED_UNIQUE_NAMES is defined so that each
struct has a different name by file.

The NEED_UNIQUE_NAMES will now be set for AIX also. The
callback_chain in poeAppl.C has been updated to also
use a unique name.

This problem surfaced at AIX 5.3h. It will be fixed in
v34 and v35.

[John Robb]

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3.4 updates:
Checking in src/lib/32bit/Makefile.in;
/cvsroot/dpcl/dpcl/src/lib/32bit/Makefile.in,v <-- Makefile.in
new revision: 1.3.2.1; previous revision: 1.3
done
Checking in src/lib/64bit/Makefile.in;
/cvsroot/dpcl/dpcl/src/lib/64bit/Makefile.in,v <-- Makefile.in
new revision: 1.3.2.1; previous revision: 1.3
done
Checking in src/lib/src/PoeAppl.C;
/cvsroot/dpcl/dpcl/src/lib/src/PoeAppl.C,v <-- PoeAppl.C
new revision: 1.5.2.1; previous revision: 1.5
done

3.5 updates:
Checking in src/lib/32bit/Makefile.in;
/cvsroot/dpcl/dpcl/src/lib/32bit/Makefile.in,v <-- Makefile.in
new revision: 1.5; previous revision: 1.4
done
Checking in src/lib/64bit/Makefile.in;
/cvsroot/dpcl/dpcl/src/lib/64bit/Makefile.in,v <-- Makefile.in
new revision: 1.6; previous revision: 1.5
done
Checking in src/lib/src/PoeAppl.C;
/cvsroot/dpcl/dpcl/src/lib/src/PoeAppl.C,v <-- PoeAppl.C
new revision: 1.6; previous revision: 1.5
done