Simplify strictMode to just a property
Simplify strictMode to just a property

@weierophinney made a strong point that the extending classes will
probably just set this property themselves, thus it probably doesn't
need to be able to be set from a public scope.

weierophinney/zend-stdlib,php-refactoring/zend-array-utility,adamlundrigan/zend-stdlib,MadCat34/zend-stdlib,sravanchandj/zend-stdlib,akrabat/zend-stdlib,ezimuel/zend-stdlib