The sasenv_local file is found in <SASHome>/SASFoundation/9.4/bin, typically this is where variables would be defined to indicate where the Oracle client is installed as described in the documentation I had linked before. This file, like the _usermods files elsewhere, are not overwritten during things like updates. If these variables were not defined in one of those files it's possible the upgrade overwrote them.
More information on connecting to Oracle can be found here:
Establishing Connectivity to an Oracle Database
https://go.documentation.sas.com/doc/en/bicdc/9.4/bidsag/n017taop8cx07in1r3awuwxlyb9m.htm
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Greg Wootton | Principal Systems Technical Support Engineer