sim-main.h is special since it is one of the files automatically
included in igen generated files. But this means anything including
sim-main.h might get everything included just for the igen files.
To prevent clashing symbols/defines only include sim-fpu.h,
sim-signal.h, mn10300-sim.h from sim-main.h if it is included
from one of the generated igen C files. Add explicit includes
of mn10300-sim.h, sim-fpu.h and/or sim-signal.h to dv-mn103cpu.c,
interp.c and op_utils.c.
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