commit 942235cd88eca3be58b87f4281b892fcff850780
author Patrick Williams <patrick@stwcx.xyz> Mon Sep 26 16:52:14 2022 -0500
committer Patrick Williams <patrick@stwcx.xyz> Tue Sep 27 17:39:21 2022 +0000
tree 2f348cdef2cbfe70b441a8f61051c7f0dfdb2045
parent 5278efb6e2a361759f4499f7f8ee8433aba5e172

build-unit-test-docker: use alternative for cpp

We added an 'alternative' for GCC but not for the preprocessor.
It seems potentially problematic to use an older preprocessor,
which came with the distro, but a newer compiler, so set the
preprocessor as the same version as GCC.  The preprocessor is
required to be installed as a separate alternative and not with
the "--slave" option.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I3a3e17b93ab7ea1aad0e5ac3677ec463e0c5b5ed