Warnings in case of a VHDL error

When having a vhdl construct like:
```
entity _H_ is
```
we get the, a bit unclear, warnings like:
```
Lexical error at: 16:8. Encountered: _ after: .
```
with version 1.8.17 we got the warning:
```
.../vhdl.vhd:16: warning: Lexical error, Encountered: '_' after: ''
```
not 100% clear either but at least clear which file is involved and what the meaning of the '16' is.
Also the message didn't conform the doxygen style / place / handling of warnings / errors anymore (didn't go to the WARN_LOGFILE anymore).
(The message is correct as a vhdl identifier cannot start or end with an underscore.

Between the used javaCC versions (now 7.05) and the previously used version 6.xx apparently a small in the error handler prototypes has been introduces, and thus not finding the doxygen version anymore.

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