sh: Add a test for breaking from a loop outside the current function.

It is unwise to rely on this but I'd like to know if this would break.

tools/regression/bin/sh/builtins/break3.0

@@ -0,0 +1,15 @@
+# $FreeBSD$
+
+# We accept this and people might rely on it.
+# However, various other shells do not accept it.
+
+f() {
+	break
+	echo bad1
+}
+
+while :; do
+	f
+	echo bad2
+	exit 2
+done