Stdlib: strtok() — VM + JIT + AOT (#3201)

[PurHur]

Summary

• Implements strtok() with php-src ext/standard/string.c semantics (two-arg init + one-arg continuation).
• VM: VmString::strtok() with per-request static state; registered in ext/standard/Module.php.
• Native path: lib/AOT/runtime/phpc_strtok.c (phpc_strtok) linked for JIT/AOT via StringStrtok + JitStrtok.
• Tests: test/compliance/cases/stdlib/strtok.phpt, strtok_jit.phpt, test/fixtures/aot/cases/strtok.phpt.

php-src reference

• ext/standard/string.c — PHP_FUNCTION(strtok)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "
\$s=\"a,b,c\"; echo strtok(\$s,\",\"); echo strtok(\",\"); echo strtok(\",\"); echo strtok(\",\")===false?\"end\":\"bad\";
"'
# => abcend

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit --filter "VMTest.*strtok|AotTest.*strtok"'
# VM + AOT green

php bin/compile.php -l test/fixtures/aot/cases/strtok.phpt  # AOT lint (with script/php-env.sh in Docker)
php script/capability-matrix.php  # row: strtok | yes | yes | yes

Closes #3201

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