buildroot

busybox: bump version to 1.28.2

Drop 0003-tar-unzip-postpone-creation-of-symlinks-with-suspici.patch now upstream.

>From the release notes:

Bug fix release.  1.28.2 has fixes for tcpsvd (fixed fallout from
opt_complementary removal), udhcpd (do not ignore SIGTERM), tar and unzip
(reverted to previous, more permissive symlink handling), ssl_client (fixed
option parsing).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>