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Allow configuring predict style through the PS*P variable

Patch contributed by Thomas Vigouroux <thomas.vigouroux@protonmail.com>

Run tests about comments as POSIX sh

Skip unstable tests about stopping signals (#45760)

There are more parameter combinations we have missed to skip.

Prevent some tests from being suspended (#45760)

.github/workflows/c: Use latest actions/checkout

.github/workflows/c: Use stable apt command line

The "apt" utility is for interactive uses and its command line syntax is
subject to change. We should use "apt-get" for scripting purposes.

Also, we should update the cache before installation since the stale
cache may prevent apt from fetching the correct package.

configure: add -std=c99 conditionally (#45739)

Many users seem to try to override the default CC and/or CFLAGS without
knowing the effect of what they are doing. Our build configuration needs
a confirming C99 compiler, which may require a specific option to select
the language version. This commit adds a dynamic test that makes sure
the compiler is invoked with appropriate options.

Require $PATH search for substitutive built-ins

This commit recategorizes regular built-ins into substitutive built-ins
and extension built-ins in order to remove the use of the words "regular
built-ins," which have been used in a different meaning than mentioned
in POSIX.

To minimize the behavioral differences caused by enabling the POSIXly-
correct mode, substitutive built-ins now require a corresponding
external program when running them except for the "array" built-in which
now is an extension built-in and is completely ignored in the POSIXly-
correct mode.

Reject non-portable built-ins in POSIX mode (#43467)

To be more restrictive on non-portable features in the POSIX mode, yash
now refuses to execute built-ins listed as utilities with unspecified
results in POSIX XCU 2.9.1. The built-in category "semi-special" is
removed in favor of the new categories "mandatory" and "elective."

doc/ja: Fix translation of meta-variables

doc/ja: Remove reference to incorrect option

The break and continue built-ins do not have the interact option.

doc/ja/intro: Fix markup

Version 2.53

Up version to 2.53

configure: Avoid compiler warnings in getrlimit test

GCC 12 yields a warning when getrlimit from glibc 2.35 is called with a
second parameter being null. We should suppress the warning so the test
succeeds when compiled with the -Werror option.

configure: Avoid compiler warnings in ncurses test

Recent versions of ncurses (at least version 6.2) have some function
prototype declarations different in parameter types. Because of the
incompatible-type warning, some tests in "configure" fail when compiled
with the -Werror option. This commit rewrites the test so it does not
produce warnings when it should succeed.

Update po files

Remove branch arith-error

Avoid undefined behavior in arithmetic expansion (#45200)

Update README

Update documentation

arith: Detect error in bitwise shifting

arith: Detect overflow in division

arith: Detect overflow in +, -, and *

arith: Split calculation functions

arith: Detect overflow in ++ and --

arith: Detect overflow in unary minus

Create branch arith-error

Correct assertion in here-doc delimiter parsing (#45202)

If is_end_of_heredoc_contents is called immediately after parsing
another here-doc delimiter that is not followed by a newline, the
assertion does not hold.

Exit on assignment error in for loop (#45010)