xfstests: Clean up build output

[Alex Elder]

> We don't need to see every compiler command line for every file that
> is compiled. This makes it hard to see warnings and errors during
> compile. For progress notification, we really only need to see the
> directory/file being operated on.
> 
> Turn down the verbosity of output by suppressing various make output
> and provide better overall visibility of which directory is being
> operated on, what the operation is and what is being done to the
> files by the build/clean process.
> 
> While doing this, remove explicit target-per-file rules in the
> subdirectories being built and replace them with target based rules
> using the buildrules hooks for doing this.  This results in the
> makefiles being simpler, smaller and more consistent.
> 
> This patch does not address the dmapi subdirectory of the xfstests
> build system.
> 
> The old style verbose builds can still be run via "make V=1 ..."
> 
> Signed-off-by: Dave Chinner <david at fromorbit.com>

Didn't get this in my mail box but it looks good to me.

Reviewed-by: Alex Elder <aelder at sgi.com>