ext/opcache: merge redundant code and "bool" refactoring (#8237)

* ext/opcache/ZendAccelerator: make check_persistent_script_access() static

* ext/opcache/ZendAccelerator: convert "int" to "bool"

* ext/opcache/zend_file_cache: convert "int" to "bool"

* ext/opcache: use true/false for zend_persistent_script.corrupted

* ext/opcache/ZendAccelerator: move duplicate code to zend_accel_discard_script()

* ext/opcache/ZendAccelerator: convert accel_deactivate_now() to function

Simplify the #iddef ZEND_WIN32.

* ext/opcache/zend_file_cache: simplify iovec initializer

* ext/opcache/zend_file_cache: add local zend_string* variables

Eliminates lots of redundant casts and avoids reloading the variable
from RAM into registers.

* ext/opcache/zend_file_cache: use ZSTR_VAL()

* ext/opcache/zend_file_cache: move code to zend_file_cache_script_write()

This eliminates duplicate error handling code.

Author: MaxKellermann