systemc: Move systemc disabling checks to SConsopts.
This will ensure that the value of USE_SYSTEMC is consistent throughout
the build. It also has the side effect that USE_SYSTEMC can be forced
to a particular value if you're confident you know what you're doing
and want to override these checks.
Reviewed-by: Gabe Black <email@example.com>
Maintainer: Gabe Black <firstname.lastname@example.org>
2 files changed