sh: Fix break/continue/return in multiline eval.

Example:
  eval $'return\necho bad'

bin/sh/eval.c

@@ -168,6 +168,8 @@ evalstring(char *s, int flags)
 			else
 				evaltree(n, flags);
 			any = 1;
+			if (evalskip)
+				break;
 		}
 		popstackmark(&smark);
 		setstackmark(&smark);

bin/sh/tests/builtins/Makefile

@@ -72,6 +72,8 @@ FILES+=		eval3.0
 FILES+=		eval4.0
 FILES+=		eval5.0
 FILES+=		eval6.0
+FILES+=		eval7.0
+FILES+=		eval8.7
 FILES+=		exec1.0
 FILES+=		exec2.0
 FILES+=		exit1.0

bin/sh/tests/builtins/eval7.0

@@ -0,0 +1,9 @@
+# $FreeBSD$
+# Assumes that break can break out of a loop outside eval.
+
+while :; do
+	eval "break
+echo bad1"
+	echo bad2
+	exit 3
+done

bin/sh/tests/builtins/eval8.7

@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+f() {
+	eval "return 7
+echo bad2"
+}
+f