[php-src] Issue #8142: Compilation error on cygwin

Issue: https://github.com/php/php-src/issues/8142 Author: matyhtf ### Description Error while compiling php on cygwin ```shell ./configure --disable-all \ --with-openssl --enable-openssl \ --with-curl \ --with-iconv \ --with-bz2 \ --enable-bcmath \ --enable-pcntl \ --enable-filter \ --enable-session \ --enable-tokenizer \ --enable-mbstring \ --enable-ctype \ --with-zlib \ --with-zip \ --enable-posix \ --enable-sockets \ --enable-pdo \ --with-sqlite3 \ --enable-phar \ --enable-mysqlnd \ --with-mysqli \ --enable-intl \ --enable-fileinfo \ --with-pdo_mysql \ --with-pdo-sqlite \ --enable-soap \ --with-xsl \ --with-gmp \ --enable-exif \ --with-sodium \ --enable-xml --enable-simplexml --enable-xmlreader --enable-xmlwriter --enable-dom --with-libxml \ --enable-gd --with-jpeg --with-freetype \ --enable-swoole --enable-sockets --enable-mysqlnd --enable-http2 --enable-swoole-json --enable-swoole-curl --enable-cares \ --enable-redis \ --with-imagick \ --with-yaml ... make ``` Resulted in this output: ```shell In file included from /home/work/php-src/Zend/zend.h:41, from /home/work/php-src/main/php.h:31, from /home/work/php-src/ext/intl/intl_convertcpp.cpp:20: /home/work/php-src/Zend/zend_signal.h:44:9: error: ‘siginfo_t’ does not name a type 44 | siginfo_t *siginfo; | ^~~~~~~~~ In file included from /home/work/php-src/Zend/zend_types.h:25, from /home/work/php-src/ext/intl/intl_convertcpp.h:23, from /home/work/php-src/ext/intl/intl_convertcpp.cpp:17: /home/work/php-src/Zend/zend_portability.h:370:18: error: ‘sigjmp_buf’ does not name a type; did you mean ‘jmp_buf’? 370 | # define JMP_BUF sigjmp_buf | ^~~~~~~~~~ /home/work/php-src/Zend/zend_globals.h:159:9: note: in expansion of macro ‘JMP_BUF’ 159 | JMP_BUF *bailout; | ^~~~~~~ make: *** [Makefile:1252: ext/intl/intl_convertcpp.lo] Error 1 ``` ```shell /home/work/php-src/ext/pcntl/pcntl.c: In function ‘pcntl_siginfo_to_zval’: /home/work/php-src/ext/pcntl/pcntl.c:1198:98: error: ‘siginfo_t’ has no member named ‘si_band’ 1198 | add_assoc_long_ex(user_siginfo, "band", sizeof("band")-1, siginfo->si_band); | ^~ make: *** [Makefile:1546: ext/pcntl/pcntl.lo] Error 1 make: *** Waiting for unfinished jobs.... ``` ### PHP Version PHP 8.1.1 ### Operating System CYGWIN_NT-10.0 ***** 3.3.4(0.341/5/3) 2022-01-31 19:35 x86_64 Cygwin