gEDA-dev: Silence libtool when compiling libgeda PATCH

[Ales Hvezda]

Hi Peter,

> The attached patch adds --silent to invocations of libtool, so it
> doesn't echo the actual gcc ... command being executed. On its own, not
> so useful - but when combined with make -s, (silent), you will only see
> warnings output from gcc - they won't get lost in the other make output.
> 
> Can someone familiar with automake, libtool etc.. check this is sane -
> and portable.

Seems quite sane and works for me.  Applied and commited to CVS.

Thanks,
-Ales