Fix SFTP library target

src/sftp/GNUmakefile

@@ -15,7 +15,7 @@ include $(SRC_ROOT)/build/Common.gmake	# defines clean and output directory rule
 CFLAGS += -I$(XPDEV_SRC) $(XPDEV-MT_CFLAGS)
 
 # MT-SFTP Library Link Rule
-$(SFTPLIB-MT_BUILD): $(MT_OBJS)
+$(SFTPLIB-MT_BUILD): $(MT_OBJS) | $(LIBODIR)
 	@echo Creating $@ ...
 	$(QUIET)$(AR) rc $@ $(MT_OBJS)
 	$(QUIET)$(RANLIB) $@

src/sftp/targets.mk

@@ -2,4 +2,4 @@ SFTPLIB-MT_BUILD = $(LIBODIR)$(DIRSEP)$(LIBPREFIX)sftp_mt$(LIBFILE)
 
 all: mtlib
 
-mtlib: $(MTOBJODIR) $(LIBODIR) $(XPDEV-MT_LIB) $(SFTPLIB-MT_BUILD)
+mtlib: $(SFTPLIB-MT_BUILD)