Fix undefined symbol error with pragma nosymbolcase Made symbol tree lookup handle case sensitivity correctly. It is not sufficient to switch which of strcmp and strcasecmp is used to do the lookups. Instead, one must use strcasecmp all the way until a match and then use additional sorting once a match is achieved, if relevant. In this case, a simple linked list of symbols that differ only in case since this is not expected to be a common case.

The lwbasic directory is an in-progress attempt to write a compiler for a
dialect of basic specifically targetted at the 6809 CPU. It is still
incomplete but is included in this distribution in case someone finds the
code useful. It is not built by default.