Enabling automake silent-rules by default

[Behdad Esfahbod <behdad behdad org>]

Hi,

Many modules have already been adding support for automake silent rules, but 
turned off by default.

I just pushed changes to pango and vte to enable silent rules by default. 
That's a much saner default, and allows catching warnings easily.  I like to 
suggest everyone does the same.

You just need to add this line to configure.ac after AM_INIT_AUTOMAKE:

m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])

That does most of the job.  For custom make rules, you need to add $(AM_V_GEN) 
to the beginning of the rule.  Read this for details:

  http://www.flameeyes.eu/autotools-mythbuster/automake/silent.html


Cheers,
behdad