[Libreoffice] --enable-werror

[Stephan Bergmann]

Just a friendly reminder that all developers should use --enable-werror 
all the time.

It helps yourself (you find potential errors early), your fellow 
developers (they don't need to fix your warnings for you), and our users 
(via a more stable product).

(Different compilers tend to catch slightly different sets of warnings, 
so it does happen that a developer misses some...)

-Stephan