Remove unused and deprecated Code
Remove unused and deprecated Code

Function is not used anymore anywhere in the code base: https://github.com/search?q=user%3Aowncloud+secureRNGAvailable&type=Code&utf8=%E2%9C%93

sharidas/core,bluelml/core,Ardinis/server,IljaN/core,cernbox/core,xx621998xx/server,endsguy/server,michaelletzgus/nextcloud-server,lrytz/core,pollopolea/core,michaelletzgus/nextcloud-server,pollopolea/core,cernbox/core,owncloud/core,andreas-p/nextcloud-server,whitekiba/server,pmattern/server,owncloud/core,pmattern/server,pixelipo/server,endsguy/server,whitekiba/server,whitekiba/server,IljaN/core,sharidas/core,xx621998xx/server,endsguy/server,Ardinis/server,pixelipo/server,bluelml/core,pmattern/server,pixelipo/server,andreas-p/nextcloud-server,lrytz/core,lrytz/core,pmattern/server,owncloud/core,pollopolea/core,bluelml/core,jbicha/server,nextcloud/server,xx621998xx/server,andreas-p/nextcloud-server,lrytz/core,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,cernbox/core,Ardinis/server,jbicha/server,sharidas/core,jbicha/server,owncloud/core,endsguy/server,cernbox/core,IljaN/core,cernbox/core,whitekiba/server,sharidas/core,owncloud/core,pollopolea/core,bluelml/core,jbicha/server,lrytz/core,sharidas/core,endsguy/server,phil-davis/core,nextcloud/server,nextcloud/server,pixelipo/server,michaelletzgus/nextcloud-server,pixelipo/server,bluelml/core,xx621998xx/server,pmattern/server,IljaN/core,pollopolea/core,IljaN/core,xx621998xx/server,Ardinis/server,andreas-p/nextcloud-server,jbicha/server,whitekiba/server,Ardinis/server