oleaut32/typelib.c: Fixes to static functions v2

[Andrew de Quincey]

First set of fixes to typelib.c

1) Implement HELPDIR subkeys properly in RegisterTypeLib()

2) Implement UnRegisterTypeLib()

3) Fix various minor bugs I found in the other static functions.

The changes I've made come from reading MSDN, and have been compared with a 
real windows installation using a test program, and regmon etc from 
sysinternals.com. 



This version has had some stray debug code removed.
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