Also make the letbinding C variables static

I was getting run-time failures when code generate from cheri128 and
cheri64 in the same process. This was caused because my compiler defaults
to -fcommon so it merged multiple variables (with conflicting types!).
When initializing the second set of letbindings, the first one was
overwritten (first variable was lbits, the other was uint64_t). Compiling
with -fno-common exposes this problem.

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