Description:
------------
multiple compile warnings with --disable-ipv6 --enable-sockets.

Marked version PHP 8, but some warnings are probably present in most previous releases too.

Test script:
---------------
#!/bin/sh
set -ex
make clean || true
./buildconf -f
./configure --disable-all --disable-phpdbg --disable-ipv6 --enable-sockets --enable-werror
make -j $(nproc)

Actual result:
--------------
[...]
      |             ^~~~~~~~~~~~~~~~~~~~~~~
/__w/php-src/php-src/ext/sockets/conversions.c:505:13: error: 'to_zval_read_uint32' defined but not used [-Werror=unused-function]
  505 | static void to_zval_read_uint32(const char *data, zval *zv, res_context *ctx)
      |             ^~~~~~~~~~~~~~~~~~~
/__w/php-src/php-src/ext/sockets/conversions.c:491:13: error: 'to_zval_read_unsigned' defined but not used [-Werror=unused-function]
  491 | static void to_zval_read_unsigned(const char *data, zval *zv, res_context *ctx)
      |             ^~~~~~~~~~~~~~~~~~~~~
/bin/bash /__w/php-src/php-src/libtool --silent --preserve-dup-deps --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -Iext/sockets/ -I/__w/php-src/php-src/ext/sockets/ -DPHP_ATOM_INC -I/__w/php-src/php-src/include -I/__w/php-src/php-src/main -I/__w/php-src/php-src -I/__w/php-src/php-src/ext/date/lib -I/usr/include/libxml2 -I/usr/include/x86_64-linux-gnu -I/usr/include/enchant -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/libpng16 -I/usr/include/freetype2 -I/__w/php-src/php-src/ext/mbstring/libmbfl -I/__w/php-src/php-src/ext/mbstring/libmbfl/mbfl -I/usr/include/postgresql -I/usr/include/pspell -I/usr/include/tidy -I/__w/php-src/php-src/TSRM -I/__w/php-src/php-src/Zend    -I/usr/include -g -O2 -fvisibility=hidden -Wall -Wextra -Wno-strict-aliasing -Wno-implicit-fallthrough -Wno-unused-parameter -Wno-sign-compare -Wno-clobbered -DZEND_SIGNALS -Werror   -c /__w/php-src/php-src/ext/sockets/sockaddr_conv.c -o ext/sockets/sockaddr_conv.lo 
/__w/php-src/php-src/ext/sockets/conversions.c: In function 'from_zval_write_controllen':
/__w/php-src/php-src/ext/sockets/conversions.c:1116:24: error: 'len' may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1116 |  msghdr->msg_control = accounted_emalloc(len, ctx);
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Makefile:1685: ext/sockets/conversions.lo] Error 1
[...]