Move creation of stageN/lib directories to the configure script

configure

@@ -179,6 +179,7 @@ for i in \
     rt rt/isaac rt/bigint rt/sync rt/test rt/arch/i386 \
     rustllvm \
     dl stage0 stage1 stage2 stage3 \
+    stage0/lib stage1/lib stage2/lib stage3/lib \
     test/run-pass test/run-fail test/compile-fail \
     test/bench/99-bottles test/bench/shootout     
 do

mk/stage0.mk

@@ -1,6 +1,5 @@
 stage0/rustc$(X): $(S)src/snapshots.txt $(S)src/etc/get-snapshot.py $(MKFILES)
 	@$(call E, fetch: $@)
-	mkdir -p stage0/lib
 	$(Q)$(S)src/etc/get-snapshot.py
 	$(Q)touch $@
 

mk/stage1.mk

@@ -2,7 +2,6 @@ stage1/lib/$(CFG_STDLIB): $(STDLIB_CRATE) $(STDLIB_INPUTS) \
               stage1/rustc$(X) stage0/lib/$(CFG_STDLIB) stage1/intrinsics.bc \
               stage1/glue.o $(LREQ) $(MKFILES)
 	@$(call E, compile_and_link: $@)
-	mkdir -p stage1/lib
 	$(STAGE1)  --shared -o $@ $<
 
 stage1/glue.o: stage1/rustc$(X) stage0/lib/$(CFG_STDLIB) stage1/intrinsics.bc \

mk/stage2.mk

@@ -2,7 +2,6 @@ stage2/lib/$(CFG_STDLIB): $(STDLIB_CRATE) $(STDLIB_INPUTS) \
               stage2/rustc$(X) stage1/lib/$(CFG_STDLIB) stage2/intrinsics.bc \
               stage2/glue.o $(LREQ) $(MKFILES)
 	@$(call E, compile_and_link: $@)
-	mkdir -p stage2/lib
 	$(STAGE2)  --shared -o $@ $<
 
 stage2/glue.o: stage2/rustc$(X) stage1/lib/$(CFG_STDLIB) stage2/intrinsics.bc \

mk/stage3.mk

@@ -2,7 +2,6 @@ stage3/lib/$(CFG_STDLIB): $(STDLIB_CRATE) $(STDLIB_INPUTS) \
               stage3/rustc$(X) stage2/lib/$(CFG_STDLIB) stage3/intrinsics.bc \
               stage3/glue.o $(LREQ) $(MKFILES)
 	@$(call E, compile_and_link: $@)
-	mkdir -p stage3/lib
 	$(STAGE3)  --shared -o $@ $<
 
 stage3/glue.o: stage3/rustc$(X) stage2/lib/$(CFG_STDLIB) stage3/intrinsics.bc \