Update irodssetup scripts to look for a system-installed (package
manager) ODBC library (.odbc.ini Driver) in various places as needed
for various platforms and postgresql/odbc versions.

See the irod-chat thread 'irods 3.3 and external postgres 9.2
database' for more information.



git-svn-id: svn://irodssvn.ucsd.edu/trunk@5519 ea137bd6-aa86-47b6-b90d-b101d9f19a90