turn off failing code

GNU Make 4.1 (Used in Ubuntu systems in Github CI) doesn't export
variables to $(shell) calls.

The feature was added in GNU Make 4.4

Author: linuxlizard

tests/target-specific.mk

@@ -3,8 +3,8 @@ CC:=gcc
 CFLAGS:=-Wall
 export CC FOO CFLAGS
 
-$(info $(shell echo $$CC))
-$(info $(shell printenv CC))
+#$(info $(shell echo $$CC))
+#$(info $(shell printenv CC))
 
 BAZ:=baz