* LEGAL: added license infomation of ccan files.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45940 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

LEGAL

@@ -5,6 +5,37 @@ All the files in this distribution are covered under either the Ruby's
 license (see the file COPYING) or public-domain except some files
 mentioned below.
 
+ccan/build_assert/build_assert.h
+ccan/check_type/check_type.h
+ccan/container_of/container_of.h
+ccan/str/str.h
+
+  These files are licensed under the CC0.
+
+    http://creativecommons.org/choose/zero/
+
+ccan/list/list.h
+
+  This file is licensed under the MIT License.
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in
+    all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+    THE SOFTWARE.
+
 include/ruby/oniguruma.h:
 regcomp.c:
 regenc.[ch]: