Merge "Make ScriptC's mEnvironment.mIsThreadable survive the bcc caching and then cache-reloading."

static BCCvoid* symbolLookup(BCCvoid* pContext, const BCCchar* name) {

    const ScriptCState::SymbolTable_t *sym;

    ScriptC *s = (ScriptC *)pContext;

    if (!strcmp(name, "__isThreadable")) {

      return (BCCvoid*) s->mEnviroment.mIsThreadable;

    } else if (!strcmp(name, "__clearThreadable")) {

      s->mEnviroment.mIsThreadable = false;

      return NULL;

    }

    sym = ScriptCState::lookupSymbol(name);

    if (!sym) {

        sym = ScriptCState::lookupSymbolCL(name);