Description:
------------
Running on Linux, GLIBC 2.34, GCC 11.2, ICU 70.1, compiling PHP 'master' from GIT, not a snapshot. Configure command used included in script, below.

ICU 70.1 notes on https://icu.unicode.org/download/70

ICU4C Specific Changes documented there include:

 . ICU operator==() and operator!=() functions now return bool instead of UBool

Because of this change, PHP with intl support enabled will not compile on a system with ICU >= 70.1 installed. To fix this a patch is needed, which I include as an attachment. HOWEVER, it is entirely possible that this patch would break compilations using ICU versions older than ICU 70.1! Therefore, a better patch is needed, one that checks the ICU version and conditionally compiles with UBool or bool based on that.

Test script:
---------------
git clone https://github.com/php/php-src.git
cd php-src/
git checkout master
./buildconf
./configure --enable-intl
make


Expected result:
----------------
I want it to compile. It won't without the patch I provide. However, the patch I provide would, as written, probably make it so PHP cannot be compiled with versions of ICU4C that are older than 70.1. A better patch would check the installed ICU version and use UBool for < 70.1 and bool for >= 70.1.