nlattr: add unsigned int decoders that print in hex form

[strace] / .mailmap

# Map git author names and email addresses to canonical/preferred form.
<ak@linux.intel.com>    <ak@suse.de>
Chen Jingpiao   <chenjingpiao@gmail.com>
Chen Jingpiao   <chenjingpiao@gmail.com>        <chenjingpiao@foxmail.com>
<damir@altlinux.org>    <damir@altlinux.ru>
<dgilbert@redhat.com>   <dave@treblig.org>
<edgar.iglesias@gmail.com>      <edgar@axis.com>
<holger@freyther.de>    <zecke@selfish.org>
<kirill@shutemov.name>  <kirill.shutemov@linux.intel.com>
<mark.hills@framestore.com>     <Mark.Hills@framestore.com>
<nahim+dev@naam.me>     <naam@lse.epita.fr>
<patrik.r.jakobsson@gmail.com>  <patrik.jakobsson@linux.intel.com>
<schwab@linux-m68k.org> <schwab@redhat.com>
<schwab@linux-m68k.org> <schwab@suse.de>
<steve@einval.com>      <steve.mcintyre@linaro.org>
<thomas.de.schampheleire@gmail.com>     <thomas.de_schampheleire@nokia.com>
<vda.linux@googlemail.com>      <dvlasenk@redhat.com>
<vincent@gentoo.org>    <vincent.riera@imgtec.com>
<Vineet.Gupta1@synopsys.com>    <vgupta@synopsys.com>
<will@williammanley.net>        <william.manley@youview.com>
Carmelo Amoroso <carmelo.amoroso@st.com>
Edgar Kaziakhmedov      <edgar.kaziakhmedov@virtuozzo.com>      <edos@linux.com>
Elvira Khabirova        <lineprinter@altlinux.org>      <lineprinter0@gmail.com>
Eugene Syromyatnikov    <evgsyr@gmail.com>
Eugene Syromyatnikov    <evgsyr@gmail.com>      <esyr@redhat.com>
Frederik Schüler       <fs@debian.org>
Md Haris Iqbal  <haris.phnx@gmail.com>