i386 config w/tpm* at acpi? build fails.

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

Shortly after i386-current switched to GCC-6, my first (non-update) build
went fine.  Since then, something changed and now configs which include:

  tpm* at acpi?

fail with:

[...]
--- tpm_acpi.o ---
/x/current/src/sys/dev/acpi/tpm_acpi.c:88:27: error: 'tpm_acpi_ids' defined but not used [-Werror=unused-const-variable=]
 static const char * const tpm_acpi_ids[] = {
                           ^~~~~~~~~~~~
[...]


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