Due to KConfig misbehavior the tar config options where getting
enabled even when tar was not enabled.  We fix this by enclosing
the options in an if PACKAGE_tar ; endif block.

Signed-off-by: Daniel Dickinson <lede@daniel.thecshore.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

This patch make building tar with POSIX ACL and XATTR
support configuration options.  It also makes building
seamless (e.g. -z -J -j) compression support a configuration
option for each compression program available in OpenWrt.

It also makes POSIX ACL support disabled by default
(by default OpenWrt doesn't build POSIX ACL support
into the kernel, never mind allowing to mount with it
enabled).  Also XATTR support is disabled by
default as this seems to be the standard default for packages
in OpenWrt.

Finally Bzip2, Gzip, and XZ seamless support are made
available by default and appropriate dependencies
are added based on the configuration choice.

Signed-off-by: Daniel Dickinson <openwrt@daniel.thecshore.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>