[Github-comments] [geany] Comment-out some options not available on older doxygen versions (#925)

[Jiří Techet]

This eliminates some warnings with doxygen 1.8.7 on Ubuntu 14.04.4 LTS
based system. The default values of these options are equal to the
commented-out values so nothing should be broken by this change.

Without this I get

```
Warning: Tag `CLANG_ASSISTED_PARSING' at line 1034 of file `Doxyfile' belongs to an option that was not enabled at compile time.
         To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u", or recompile doxygen with this feature enabled.
Warning: Tag `CLANG_OPTIONS' at line 1042 of file `Doxyfile' belongs to an option that was not enabled at compile time.
         To avoid this warning please remove this line from your configuration file or upgrade it using "doxygen -u", or recompile doxygen with this feature enabled.
Warning: ignoring unsupported tag `DOCBOOK_PROGRAMLISTING =' at line 1912, file Doxyfile
Warning: ignoring unsupported tag `PLANTUML_JAR_PATH      =' at line 2339, file Doxyfile
```
You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany/pull/925

-- Commit Summary --

  * Comment-out some options not available on older doxygen versions

-- File Changes --

    M doc/Doxyfile.in (8)

-- Patch Links --

https://github.com/geany/geany/pull/925.patch
https://github.com/geany/geany/pull/925.diff

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https://github.com/geany/geany/pull/925
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