Remove check for echo

Author: veera-sivarajan

tests/run-make-fulldeps/hotplug_codegen_backend/Makefile

@@ -6,10 +6,6 @@ include ../../run-make/tools.mk
 # backends and that this external codegen backend is only included in the dep info if
 # -Zbinary-dep-depinfo is used.
 
-REQUIRED := echo # This test requires `echo` to exist
-$(foreach bin,$(REQUIRED),\
-    $(if $(shell command -v $(bin) 2> /dev/null),,$(error Error: Please install `$(bin)`)))
-
 all:
 	$(RUSTC) the_backend.rs --crate-name the_backend --crate-type dylib \
 		-o $(TMPDIR)/the_backend.dylib