Changeset 11837:f68a638dd4c7
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ext: Include SystemC 2.3.1 into gem5

In the past it happened several times that some changes in gem5 broke the
SystemC coupling. Recently Accelera has changed the licence for SystemC from
their own licence to Apache2.0, which is compatible with gem5. However, SystemC
usually relies on the Boost library, but I was able to exchange the boost calls
by c++11 alternatives. The recent SystemC version is placed into /ext and is
integrated into gem5's build system. The goal is to integrate some SystemC
tests for the CI in some following patches.