Revert "Revert "Stop forcing php5 in mwscript""
This reverts commit 48b9d506a9bb7386d92b1bcaed109dc776ca0415.
We need to revert to using php instead of php5 because of the ICU
migration that is happening today and is non-reversible.
We can migrate from tin to deploy1001 and use php7 there as far as scap
THIS PATCH SHOULD NOT BE REVERTED EVER. Or huge breakages will happen.