nickle: update to 2.95.

    Version 2.95
    test: Run tests with MALLOC_CHECK_ and MALLOC_PERTURB_ set
    Initialize SymbolLocal 'code' in allocators
    json: Handle empty arrays and objects
    Version 2.94
    test: Fix how math-tables is built
    test: Test true/false/null values in json
    Add true/false/null and file in/out to json.5c

(wiz)