Tidy up snap makefile.

Author: graydon

mk/snap.mk

@@ -1,10 +1,10 @@
 
 snap-stage1: stage1/rustc$(X) stage1/glue.o stage1/lib/$(CFG_STDLIB)
-	$(CFG_SRC_DIR)src/etc/make-snapshot.py stage1
+	$(S)src/etc/make-snapshot.py stage1
 
 snap-stage2: stage2/rustc$(X) stage2/glue.o stage2/lib/$(CFG_STDLIB)
-	$(CFG_SRC_DIR)src/etc/make-snapshot.py stage2
+	$(S)src/etc/make-snapshot.py stage2
 
 snap-stage3: stage3/rustc$(X) stage3/glue.o stage3/lib/$(CFG_STDLIB)
-	$(CFG_SRC_DIR)src/etc/make-snapshot.py stage3
+	$(S)src/etc/make-snapshot.py stage3