Log Message:
libidn: update to 1.42.

* Noteworthy changes in release 1.42 (2024-01-13) [stable]

** Bump required gettext version to 0.19.8 for musl-libc.

** Compiler warning improvements.
As before, compiler warnings are enabled by default.  You may disable
them using ./configure --disable-gcc-warnings or turn them into fatal
errors using ./configure --enable-gcc-warnings=error to add -Werror
and sensible -Wno-error='s.  Based on gnulib's manywarnings, see
<https://www.gnu.org/software/gnulib//manual/html_node/manywarnings.html>.

** Fix type confusion on LLP64/Windows platforms.
While libidn has worked using cygwin libc, it has never worked on
ucrt/msvcrt libc.  Report and tiny patch by Francesco Pretto in
<https://lists.gnu.org/archive/html/help-libidn/2022-02/msg00000.html>.

** tests: Added script tests/standalone.sh suitable for integrators.
The main purpose is to test a system-installed libidn, suitable for
distributor checking (a'la Debian's autopkgtest/debci).  It may also
be used to test a newly built libidn outside the usual 'make check'
infrastructure.  To check that your system libidn is working, invoke
the script with `srcdir` as an environment variable indicating where
it can be find the source code for libidn's tests/ directory (it will
use the directory name where the script is by default):

tests/standalone.sh

To check that a newly built static libidn behaves, invoke:

env STANDALONE_CFLAGS="-Ilib lib/.libs/libidn.a" tests/standalone.sh

To check that a newly built shared libidn behaves, invoke:

env srcdir=tests STANDALONE_CFLAGS="-Ilib -Wl,-rpath lib/.libs \ 
lib/.libs/libidn.so" tests/standalone.sh

If the libidn under testing is too old and has known bugs, that should
cause tests to fail, which is intentional.

** Updated translations.

** Update gnulib files and build fixes.