build: rework verbosity level selection

V=99 and V=1 are now deprecated in favor of a new verbosity class system,
though the old flags are still supported.
You can set the V variable on the command line (or OPENWRT_VERBOSE in the
environment) to one or more of the following characters:

- s: stdout+stderr (equal to the old V=99)
- c: commands (for build systems that suppress commands by default, e.g. kbuild)
- w: warnings/errors only (equal to the old V=1)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31484 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/feeds

@@ -540,7 +540,7 @@ sub update {
 	my $perform_update=1;
 
 	$ENV{SCAN_COOKIE} = $$;
-	$ENV{KBUILD_VERBOSE} = 99;
+	$ENV{OPENWRT_VERBOSE} = 's';
 
 	getopts('ahi', \%opts);