vsftpd: create .configured stamp file

Ensures that the configure+make steps are not run every time.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/vsftpd/vsftpd.mk

@@ -42,10 +42,12 @@ endif
 else # not uclibc
 	$(SED) 's,.*__UCLIBC_.*,,g' $(VSFTPD_DIR)/builddefs.h
 endif
+	touch $@
 
 
 $(VSFTPD_DIR)/$(VSFTPD_BINARY): $(VSFTPD_DIR)/.configured
 	$(MAKE) CC=$(TARGET_CC) CFLAGS="$(TARGET_CFLAGS)" LIBS="$(VSFTPD_LIBS)" -C $(VSFTPD_DIR)
+	touch -c $@
 
 $(TARGET_DIR)/$(VSFTPD_TARGET_BINARY): $(VSFTPD_DIR)/$(VSFTPD_BINARY)
 	cp -dpf $< $@