* configure.ac: When deciding whether to use bundled version of kernel
headers, ignore the SUBLEVEL part of the kernel version, assuming that
any potential changes in UAPI introduced in stable kernels are not
important.

Resolves: https://github.com/strace/strace/issues/253

It used the wrong attribute table initially.

An example of an actual usage:
    tc actions add action simple sdata "foobar" index 1

* src/xlat/rtnl_tca_root_attrs.in: New file.
* src/xlat/rtnl_tca_root_flags.in: Likewise.
* src/rtnl_tc_action.c: Include "xlat/rtnl_tca_root_flags.h"
and "xlat/rtnl_tca_root_attrs.h".
(tcamsg_nla_decoders): Rename to...
(tca_act_nla_decoders): ...this.
(decode_tca_action, decode_tca_root_act_tab, decode_tca_root_act_flags,
decode_tca_msecs): New functions.
(tcamsg_nla_decoders): New decoder table.
(decode_tcamsg): Use rtnl_tca_root_attrs and "TCA_ROOT_???" as xlat
and dflt arguments in the decode_nlattr call. respectively.
* tests/.gitignore: Add nlattr_tcamsg-Xabbrev, nlattr_tcamsg-Xraw,
and nlattr_tcamsg-Xverbose.
* tests/pure_executables.list: Likewise.
* tests/gen_tests.in (nlattr_tcamsg-Xabbrev, nlattr_tcamsg-Xraw,
nlattr_tcamsg-Xverbose): New tests.
* tests/nlattr_tcamsg-Xabbrev.c: New file.
* tests/nlattr_tcamsg-Xraw.c: Likewise.
* tests/nlattr_tcamsg-Xverbose.c: Likewise.
* tests/nlattr_tcamsg.c: Update the expected output.

Also, remove all this dance with separate fractional part printing as %f
doesn't trim the trailing zeroes and checking whether %g does the right
thing in all cases is too much hassle.

* src/defs.h (print_ticks): New declaration.
* src/util.c (print_ticks): New function.
(print_clock_t): Call it.

* src/stage_output.c (strace_open_memstream, strace_close_memstream):
Fix HAVE_OPEN_MEMSTREAM check.

* NEWS: Add a header line for the next release.
* debian/changelog.in: Add a changelog entry for 6.3-1.
* strace.spec.in: Likewise.

* NEWS: Update for 6.3 release.

Indent the C preprocessor directives to reflect their nesting
using the following script:

$ cppi -l $(git grep -El '^[[:space:]]*#[[:space:]]*(if|ifdef|ifndef|elif|else|endif|define|pragma)[[:space:]]' src tests |grep -v '\.sh$') |while read f; do
	cppi < "$f" > "$f".cppi; mv "$f".cppi "$f"
done

* tests/Makefile.am (DECODER_TESTS, MISC_TESTS, check_SCRIPTS,
check_DATA, EXTRA_DIST): Make the list sorted again.
* tests/gen_tests.in: Likewise.
* tests/pure_executables.list: Likewise.

* tests/options-syntax.test: Check --argv0 without command.
* tests/strace--argv0.test: New test.
* tests/strace--argv0.expected: New file.
* tests/Makefile.am (MISC_TESTS): Add strace--argv0.test.
(check_DATA): Add strace--argv0.expected.

This option is useful for tracing multi-call executables which interpret
argv[0], such as busybox or kmod.

* NEWS: Mention this.
* doc/strace.1.in: Document this.
* src/strace.c (usage): Likewise.
(argv0): New variable.
(startup_child): Use it.
(GETOPT_ARGV0): New enum constant.
(longopts, init): Use it.

Co-authored-by: Dmitry V. Levin <ldv@strace.io>
Resolves: https://github.com/strace/strace/pull/248