mk: target.mk host.mk fix for duplicated rules of mingw32 after #6235

Author: yichoi

mk/host.mk

@@ -130,8 +130,10 @@ $$(HLIB$(2)_H_$(4))/$(CFG_RUSTLLVM_$(4)): \
 $$(HBIN$(2)_H_$(4))/:
 	mkdir -p $$@
 
+ifneq ($(CFG_LIBDIR),bin)
 $$(HLIB$(2)_H_$(4))/:
 	mkdir -p $$@
+endif
 
 endef
 

mk/target.mk

@@ -86,8 +86,10 @@ endif
 $$(TBIN$(1)_T_$(2)_H_$(3))/:
 	mkdir -p $$@
 
+ifneq ($(CFG_LIBDIR),bin)
 $$(TLIB$(1)_T_$(2)_H_$(3))/:
 	mkdir -p $$@
+endif
 
 endef