ctf/cvt: fix Clang -Wmissing-variable-declarations warnings
The attached patch adds some missing static-keywords to various source files in ctf/cvt. This silences some of the warnings emitted by Clang's -Wmissing-variable-declarations. The intent of this compiler flag is to prevent the number of symbols in a binary, more reliably detect ununused variables and make more data in an object file read-only.
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