MB-11027: Make CMAKE_ERL_LIB_INSTALL_PREFIX a cached variable so we can modify it as part of the build
Change-Id: I5bc26c3413bd49d9a924d3a3f5dd64a01a9019a7
Reviewed-on: http://review.couchbase.org/37024
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Sriram Melkote <siri@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>