phpExtensions.protobuf: fix build with PHP 8

[jojosch]

Motivation for this change

Wanted to try PHP 8 with an application from work which uses the protobuf extension. The build fails with:

builder for '/nix/store/7nci6jwbp0lcvggknpbfn3lv53synxdx-php-protobuf-3.14.0.drv' failed with exit code 2; last 10 log lines:
  /nix/store/kl6lr3czkbnr6m5crcy8ffwfzbj8a22i-bash-4.4-p23/bin/bash /build/protobuf-3.14.0/libtool --mode=compile gcc -I. -I/build/protobuf-3.14.0 -I/build/protobuf-3.14.0/include -I/build/protobuf-3.14.0/main -I/build/protobuf-3.14.0 -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/main -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/TSRM -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/Zend -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -std=gnu99 -c /build/protobuf-3.14.0/arena.c -o arena.lo
  mkdir .libs
   gcc -I. -I/build/protobuf-3.14.0 -I/build/protobuf-3.14.0/include -I/build/protobuf-3.14.0/main -I/build/protobuf-3.14.0 -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/main -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/TSRM -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/Zend -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -std=gnu99 -c /build/protobuf-3.14.0/arena.c  -fPIC -DPIC -o .libs/arena.o
  /nix/store/kl6lr3czkbnr6m5crcy8ffwfzbj8a22i-bash-4.4-p23/bin/bash /build/protobuf-3.14.0/libtool --mode=compile gcc -I. -I/build/protobuf-3.14.0 -I/build/protobuf-3.14.0/include -I/build/protobuf-3.14.0/main -I/build/protobuf-3.14.0 -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/main -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/TSRM -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/Zend -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext/date/lib  -DHAVE_CONFIG_H  -g -O2   -std=gnu99 -c /build/protobuf-3.14.0/array.c -o array.lo
   gcc -I. -I/build/protobuf-3.14.0 -I/build/protobuf-3.14.0/include -I/build/protobuf-3.14.0/main -I/build/protobuf-3.14.0 -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/main -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/TSRM -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/Zend -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext -I/nix/store/xy3fdbc89l3p91dg5yafbmwrmsrm25ip-php-8.0.1-dev/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -std=gnu99 -c /build/protobuf-3.14.0/array.c  -fPIC -DPIC -o .libs/array.o
  /build/protobuf-3.14.0/array.c: In function 'Array_ModuleInit':
  /build/protobuf-3.14.0/array.c:639:4: error: 'zend_object_handlers' {aka 'struct _zend_object_handlers'} has no member named 'compare_objects'
    639 |   h->compare_objects = RepeatedField_compare_objects;
        |    ^~
  make: *** [Makefile:210: array.lo] Error 1

Grabbed the changes from protocolbuffers/protobuf#8105

Result of nixpkgs-review run on x86_64-linux 1

3 packages built:

• php73Extensions.protobuf
• php74Extensions.protobuf
• php80Extensions.protobuf

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[etu]

@ofborg build php73Extensions.protobuf php74Extensions.protobuf php80Extensions.protobuf