Fix gc15 rebuilding of the runtime
Fix gc15 rebuilding of the runtime

davidkaya/gb,inconshreveable/gb,constabulary/gb,ches/gb,inconshreveable/gb,ches/gb,mopemope/gb,tianon/gb,lparkes/gb,mopemope/gb,tianon/gb,tbruyelle/gb,mopemope/gb,hyper-carrot/gb,hyper-carrot/gb,constabulary/gb,davidkaya/gb,constabulary/gb,tbruyelle/gb