Also allow adding static to model_{init,fini,main}()

Without this I get the following linker error when trying to include both
64 and 128 bit sail-riscv code in the same binary:

duplicate symbol '_model_init' in:
    libsail_wrapper128.a(sail_wrapper_128.c.o)
    libsail_wrapper128.a(sail_wrapper_64.c.o)
duplicate symbol '_model_main' in:
    libsail_wrapper128.a(sail_wrapper_128.c.o)
    libsail_wrapper128.a(sail_wrapper_64.c.o)
duplicate symbol '_model_fini' in:
    libsail_wrapper128.a(sail_wrapper_128.c.o)
    libsail_wrapper128.a(sail_wrapper_64.c.o)

# Conflicts:
#	src/jib/c_backend.ml

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