Removed remaining makefile file

util.mk

@@ -1,16 +0,0 @@
-# util.mk - Miscellaneous utility functions for use in Makefiles
-
-# Throws an error if the value of the variable named by $(1) is not in the list given by $(2)
-define validate-option
-  # value must be part of the list
-  ifeq ($$(filter $($(1)),$(2)),)
-    $$(error Value of $(1) must be one of the following: $(2))
-  endif
-  # value must be a single word (no whitespace)
-  ifneq ($$(words $($(1))),1)
-    $$(error Value of $(1) must be one of the following: $(2))
-  endif
-endef
-
-# Returns the path to the command $(1) if exists. Otherwise returns an empty string.
-find-command = $(shell which $(1) 2>/dev/null)