* ext/bz2: applied fixers to improve test robustness
* ext/calendar: applied fixers to improve test robustness
* ext/exif: applied fixers to improve test robustness
* ext/fileinfo: applied fixers to improve test robustness
* ext/filter: applied fixers to improve test robustness
* ext/ftp: applied fixers to improve test robustness
* ext/hash: applied fixers to improve test robustness
* ext/iconv: applied fixers to improve test robustness
* ext/ldap: applied fixers to improve test robustness
* ext/pcre: applied fixers to improve test robustness
* ext/posix: applied fixers to improve test robustness
* ext/readline: applied fixers to improve test robustness
* ext/shmop: applied fixers to improve test robustness
* ext/snmp: applied fixers to improve test robustness
* ext/sodium: applied fixers to improve test robustness
* ext/sqlite3: applied fixers to improve test robustness
* ext/sysvmsg: applied fixers to improve test robustness
* ext/sysvsem: applied fixers to improve test robustness
* ext/sysvshm: applied fixers to improve test robustness
* ext/tidy: applied fixers to improve test robustness
* ext/tokenizer: applied fixers to improve test robustness
* ext/zend_test: applied fixers to improve test robustness
* ext/zlib: applied fixers to improve test robustness
For rationale, see #6787
Extensions migrated in part 4:
* simplexml
* skeleton
* soap
* spl
* sqlite3
* sysvmsg
* sysvsem
* tidy - also removed a check for an ancient dependency version