Description:
------------
It seems in a any specific environment PHP can not be compiled with thread safety disabled.

Test script:
---------------
./configure --prefix=/opt/php71 --disable-maintainer-zts --disable-posix --enable-soap --enable-mbstring --enable-mbregex --with-jpeg-dir="/opt/jibjpeg-turbo/1.5.2" --with-gd --enable-zip --enable-bcmath --enable-pcntl --enable-ftp --enable-exif --enable-calendar --enable-sysvmsg --enable-sysvsem --enable-sysvshm --enable-static --enable-wddx --enable-shmop --with-curl --with-mcrypt --with-iconv --with-pspell --with-zlib --with-freetype-dir=/usr --enable-gd-native-ttf --enable-gd-jis-conv --with-openssl --with-pdo-mysql --with-gettext=/usr --with-bz2=/usr --with-recode=/usr --with-apxs2=/etc/apache2/bin/apxs --with-fpm-user=www-data --with-fpm-group=www-data --enable-fpm
make
sudo make install


/opt/php71/bin/php -i | grep Thread
Thread Safety => enabled

./configure --help | grep thread
--enable-maintainer-zts Enable thread safety - for code maintainers only!!
--with-tsrm-pthreads Use POSIX threads (default)

./configure --help | grep posix
--disable-posix Disable POSIX-like functions

I tried the with the addition of --disable-maintainer-zts --disable-posix, it still builds with Thread Safety => enabled

Expected result:
----------------
Thread safety => disabled

Actual result:
--------------
Thread safety => enabled