code shrink in check_errors_in_children()

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
fix error message on failure to oen /dev/null; fix zcat's help text

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
zcat: if seamless uncompressors are defined, autodetect file's format

function                                             old     new   delta
bbunpack                                             526     622     +96
packed_usage                                       29335   29341      +6
gunzip_main                                           64      67      +3

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
zcat: fix "zcat FILE" trying to do detection twice

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ifupdown: support "source" stanza in /etc/network/interfaces

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
bbunzip: ignore the -q flag with the decompressors

The -q flag is used in shell scripts for suppressing output.
Have our applets swallow the flag for compatibility.

Reported-by: Mandeep Singh Baines <msb@chromium.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Merge git://busybox.net/busybox