build,win: workaround for echo sometimes interpreting \\ from tr

Author: vtjnash

Makefile

@@ -48,7 +48,7 @@ $(BUILDROOT)/doc/_build/html/en/index.html: $(shell find $(BUILDROOT)/base $(BUI
 
 julia-symlink: julia-cli-$(JULIA_BUILD_MODE)
 ifeq ($(OS),WINNT)
-	@echo '@"%~dp0\'"$$(echo $(call rel_path,$(BUILDROOT),$(JULIA_EXECUTABLE)) | tr / '\\')"\" '%*' > $(BUILDROOT)/julia.bat
+	echo '@"%~dp0/'"$$(echo '$(call rel_path,$(BUILDROOT),$(JULIA_EXECUTABLE))')"'" %*' | tr / '\\' > $(BUILDROOT)/julia.bat
 	chmod a+x $(BUILDROOT)/julia.bat
 else
 ifndef JULIA_VAGRANT_BUILD