findcom
tp = findcom(id, fcflags);
tp = findcom(ap[0], FC_BI|FC_FUNC);
if (call_builtin(findcom("read", FC_BI),
tp = findcom(cp, FC_BI);
tp = findcom(ap[0], fcflags & (FC_BI|FC_FUNC));
tp = findcom(cp, fcflags);
struct tbl * findcom ARGS((const char *, int));