build-unit-test-docker: Drop libpldm oem-ibm option

The OEM extensions are built by default, so there's no immediate need to
specify the option. Further, the structure of the libpldm meson options
is changing with the series at [1], so dodge the associated errors for
now.

[1]: https://gerrit.openbmc.org/q/topic:%22options-rework%22+repo:openbmc/libpldm

Change-Id: Id45be82115f93758e96f5d23ca103ff8915ab061
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
1 file changed