remove make/custom.mk

diff --git a/make/custom.mk b/make/custom.mk
deleted file mode 120000 (symlink)
index 37963b5..0000000
--- a/make/custom.mk
+++ /dev/null
@@ -1 +0,0 @@
-/home/image/cs-kw/custom/custom.mk
\ No newline at end of file