user: fix compilation without -fpie

Fixes breakage by 299060a06e7c73de5cb9962edbca7f7f9e0b7f25.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/Makefile.user b/Makefile.user
index 9e4f040..7daedef 100644
--- a/Makefile.user
+++ b/Makefile.user
@@ -2,7 +2,7 @@
 
 include ../config-host.mak
 include $(SRC_PATH)/rules.mak
-include config.mak
+-include config.mak
 
 .PHONY: all