With this patch, it is no longer required to call
`ReflectionProperty#setAccessible()` or
`ReflectionMethod#setAccessible()` with `true`.
If a userland consumer already got to the point of accessing
object/class information via reflection, it makes little sense
for `ext/reflection` to disallow accessing `private`/`protected`
symbols by default.
After this patch, calling `ReflectionProperty#setAccessible(true)`
or `ReflectionMethod#setAccessible(true)` on newly instantiated
`ReflectionProperty` or `ReflectionMethod` respectively will have
no effect.
RFC: https://wiki.php.net/rfc/make-reflection-setaccessible-no-op
Closes GH-5412.
