run-tests.php enforces error_reporting=E_ALL (including E_STRICT),
setting this explicitly in not necessary. Conversely, after the
removal of some E_STRICT errors, explicitly excluding it is no
longer necessary in some places.
Introduce helper macro FC(x) for CG(file_context).x.
end_compilation() now handled by file_context_end().
While at it, dropped zval wrapper for ticcks.