Relax PHP version requirement to 5.4.16.
Relax PHP version requirement to 5.4.16.

This allows stock RHEL7 servers to run CakePHP. Hopefully 5.4.16 is high
enough that we also avoid the performance issues in windows.

Refs #4607

adopico/cakephp,tisu2tisu/cakephp,kumamidori/cakephp,michaelze/cakephp,petteyg/cakephp,justinyost/cakephp,yinhe007/cakephp,bravo-kernel/cakephp,tisu2tisu/cakephp,mvdriel/cakephp,tgr0ss/cakephp,jerems02/cakephp,cakephp/cakephp,web-player/cakephp,berrygoudswaard/cakephp,dkarvounaris/cakephp,web-player/cakephp,adopico/cakephp,elboletaire/cakephp,dakota/cakephp,jeffblack360/cakephp,garethellis36/cakephp,mvdriel/cakephp,HavokInspiration/cakephp,jerems02/cakephp,burriko/cakephp,michaelze/cakephp,erikfig/cakephp,ionas/cakephp,CakeDC/cakephp,akintoey/cakephp,thinkingmedia/cakephp,jjj117/cakephp,mvdriel/cakephp,garethellis36/cakephp,burriko/cakephp,dkarvounaris/cakephp,Phillaf/cakephp,eryw/cakephp,timhoeppner/cakephp,nrother/cakephp,CVO-Technologies/cakephp,timhoeppner/cakephp,davidyell/cakephp,petteyg/cakephp,ADmad/cakephp,timhoeppner/cakephp,CVO-Technologies/cakephp,pbaire/cakephp,khoimt/cakephp-study,CakeDC/cakephp,Balachan27/cakephp,eboominathan/cakephp,ADmad/cakephp,web-player/cakephp,eryw/cakephp,akintoey/cakephp,jjj117/cakephp,jeffblack360/cakephp,berrygoudswaard/cakephp,CakeDC/cakephp,Balachan27/cakephp,garethellis36/cakephp,tenkoma/cakephp,kumamidori/cakephp,michaelze/cakephp,kumamidori/cakephp,tisu2tisu/cakephp,cakephp/cakephp,eryw/cakephp,cakephp-fr/cakephp,jerems02/cakephp,tgr0ss/cakephp,thinkingmedia/cakephp,burriko/cakephp,CVO-Technologies/cakephp,nrother/cakephp,ionas/cakephp,ndm2/cakephp,cakephp-fr/cakephp,adopico/cakephp,tenkoma/cakephp,CakeDC/cakephp,erikfig/cakephp,jeffblack360/cakephp,dakota/cakephp,mvdriel/cakephp,jjj117/cakephp,ADmad/cakephp,erikfig/cakephp,ADmad/cakephp,ndm2/cakephp,khoimt/cakephp-study,davidyell/cakephp,justinyost/cakephp,Phillaf/cakephp,elboletaire/cakephp,Balachan27/cakephp,davidyell/cakephp,ndm2/cakephp,petteyg/cakephp,bravo-kernel/cakephp,garethellis36/cakephp,thinkingmedia/cakephp,pbaire/cakephp,Phillaf/cakephp,eboominathan/cakephp,justinyost/cakephp,khoimt/cakephp-study,yinhe007/cakephp,dkarvounaris/cakephp,dakota/cakephp,yinhe007/cakephp,akintoey/cakephp,nrother/cakephp,HavokInspiration/cakephp,bravo-kernel/cakephp,pbaire/cakephp,cakephp-fr/cakephp,eboominathan/cakephp,gmponos/cakephp,dakota/cakephp,ionas/cakephp,gmponos/cakephp,HavokInspiration/cakephp,elboletaire/cakephp,tgr0ss/cakephp,berrygoudswaard/cakephp,petteyg/cakephp,ndm2/cakephp,cakephp/cakephp,gmponos/cakephp,tenkoma/cakephp,tenkoma/cakephp,cakephp/cakephp