tools: util-linux: use --disable-all-programs

tools: util-linux: use --disable-all-programs

util-linux supports passing --disable-all-programs configure flag to
disable building anything that isnt then manually enabled.

So, lets switch to using that instead of manually having to disable all
tools we dont need.

However, current drawback is that there is no upstream support for enabling
building hexdump so I included a patch that is pending upstream[0].

[0] https://github.com/util-linux/util-linux/pull/3101

Link: https://github.com/openwrt/openwrt/pull/15806
Signed-off-by: Robert Marko <robimarko@gmail.com>