Fix MacOS issue with env.mk
Fix MacOS issue with env.mk

This is really weird. So "echo -n" was the root cause of the issue.
Initially it was thought to be "test", but with a change from "echo -n"
to "printf", the problem went away. Could this be due to line endings?

ijacquez/libyaul,ijacquez/libyaul,ijacquez/libyaul,ijacquez/libyaul