busybox: update to 1.30.0

Update busybox to 1.30.0.
Refresh patches.
Leave new features disabled by default.

Config refreshed via:

  cd package/utils/busybox/config/
  ../convert_menuconfig.pl ../../../../build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/busybox-1.30.0

  make package/busybox/compile

  cd package/utils/busybox
  ./convert_defaults.pl < ../../../build_dir/target-arm_cortex-a15+neon-vfpv4_musl_eabi/busybox-1.30.0/.config > Config-defaults.in

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>