Eliminate usages of _PP macros

Eliminate usages of _PP macros

These are either in debug code (fix them), commented out (drop
them) or in dead compatibility macros (drop them).

One usage was in php_stream_get_from_zval(), which we have not used
since at least PHP 5.2 and, judging from the fact that nobody
complained about it causing compile errors in PHP 7, nobody else
uses it either, so drop it.

There are still remaining uses in mysqli embedded and odbc birdstep.
These probably need to be dropped outright.