fixup! feat: Implement cabal-based multi-stage build system

Author: angerman

Makefile

@@ -405,6 +405,7 @@ RTS_H := \
       rts/Profiling.h \
       rts/IPE.h \
       rts/PosixSource.h \
+	  rts/RtsToHsIface.h \
       rts/Signals.h \
       rts/SpinLock.h \
       rts/StableName.h \