Use the shared library libclntsh.so to determine which Oracle version is in use rather than the static client libraries which are not shipped with Oracle XE or the instant client; thanks to Catherine Devlin for pointing this out and  providing an initial patch. In addition, allow for the situation where the instant client is installed as Linux RPMs which use different locations than the standard client in that situation.
Use the shared library libclntsh.so to determine which Oracle version is in use
rather than the static client libraries which are not shipped with Oracle XE
or the instant client; thanks to Catherine Devlin for pointing this out and 
providing an initial patch. In addition, allow for the situation where the
instant client is installed as Linux RPMs which use different locations than
the standard client in that situation.


git-svn-id: b746c3c07d6b14fe725b72f068c7252a81557b48@80 0cf6dada-cf32-0410-b4fe-d86b42e8394d

Bluehorn/cx_Oracle,Bluehorn/cx_Oracle,Bluehorn/cx_Oracle