Fix regression on platforms without ZEND_CHECK_STACK_LIMIT set

[NattyNarwhal]

There was a guard on one instance of this, but not the other. Unsure if this is the best place for this; the functions are #ifdef gated in zend_execute.c, but not the associated header; perhaps it should be #else with a nop version of the function in that case? I added a guard at this call site to be consistent with other places.

Fixes build on ppc64 CI. I couldn't seem to reproduce it with a default build on ppc64, but CI has sanitizers and such on.

/usr/bin/powerpc64-unknown-linux-gnu-ld.bfd: ext/standard/var.o: in function `php_var_serialize_intern':
/srv/actions/.cache/act/2afa8512bdf5ceb6/hostexecutor/ext/standard/var.c:1055:(.text+0x18f64): undefined reference to `zend_call_stack_size_error'
/usr/bin/powerpc64-unknown-linux-gnu-ld.bfd: ext/standard/var.o: in function `php_var_serialize_intern':
/srv/actions/.cache/act/2afa8512bdf5ceb6/hostexecutor/ext/standard/var.c:1055:(.text+0x18f64): undefined reference to `zend_call_stack_size_error'
/usr/bin/powerpc64-unknown-linux-gnu-ld.bfd: ext/standard/var.o: in function `php_var_serialize_intern':
/srv/actions/.cache/act/2afa8512bdf5ceb6/hostexecutor/ext/standard/var.c:1055:(.text+0x18f64): undefined reference to `zend_call_stack_size_error'
/usr/bin/powerpc64-unknown-linux-gnu-ld.bfd: ext/standard/var.o: in function `php_var_serialize_intern':
/srv/actions/.cache/act/2afa8512bdf5ceb6/hostexecutor/ext/standard/var.c:1055:(.text+0x18f64): undefined reference to `zend_call_stack_size_error'
clang-17: error: linker command failed with exit code 1 (use -v to see invocation)

[nielsdos]

This needs to go in 8.4 and up

[NattyNarwhal]

Oops, thanks for noticing. I'll reopen and target 8.4.

[NattyNarwhal]

Replaced with GH-16285