Try to fix the bots.

mk/stage1.mk

@@ -33,4 +33,4 @@ stage1/%$(X): $(COMPILER_CRATE) $(COMPILER_INPUTS) $(SREQ0) stage0/intrinsics.bc
 stage1/lib/$(CFG_LIBRUSTC): $(COMPILER_CRATE) $(COMPILER_INPUTS) $(SREQ1) \
                             stage1/intrinsics.bc
 	@$(call E, compile_and_link: $@)
-	$(STAGE1) --shared -o $@ $<
+	$(STAGE1) --lib -o $@ $<

mk/tests.mk

@@ -208,7 +208,7 @@ test/$(FT).rc test/$(FT_DRIVER).rs: $(TEST_RPASS_SOURCES_STAGE2) \
 
 stage2/lib/$(FT_LIB): test/$(FT).rc $(SREQ2)
 	@$(call E, compile_and_link: $@)
-	$(STAGE2) --shared -o $@ $<
+	$(STAGE2) --lib -o $@ $<
 
 test/$(FT_DRIVER)$(X): test/$(FT_DRIVER).rs stage2/lib/$(FT_LIB) $(SREQ2)
 	@$(call E, compile_and_link: $@)