* PHP-7.0:
  Fixed #73959 - lastInsertId fails to throw an exception in pdsql

* PHP-7.0:
  make timing check more forgiving in these tests

Particularly on slower VMs, the sporadic fails can still happen.
The timing is kept in an uncritical range, but allows the tests
pass there. Mayby, it'd make sense to introduce a new group for
this kind of tests, so tests requiring exact time measurement
can be avoided on unsuitable environments.

* PHP-5.6:
  put missing prototype and fix ts build

* PHP-5.6:
  Fixed bug #72759 Regression in pgo_pgsql

This is caused by the fix for #72633. Namely, lastval() throws an error,
if no nextval() was called earlier in the same session. This is by all
means correct so far, however inside a transaction it leads to an abort.
This is the opposite to MySQL's last_insert_id() which doesn't produce
any error no matter something were autoincremented or not.

To avoid existing scripts breakage in the stable branches, the previous
patch is extended to revert the transaction to the state before the lastval()
call in case of error. It is done only for 5.6 and 7.0 to retain BC. For 7.1+,
the clean behavior should persist. This is already the current behavior, when
the sequence name is explicitly passed. So there's no reason to obfuscate the
errors where this breakage is valid.