Fix links to the New BSD License in meta-data

The "New BSD License" is the "3-Clause BSD License", but the links were
pointing to the "2-Clause BSD License".

java/pom.xml

diff --git a/java/pom.xml b/java/pom.xml
index 41c9b9d..0257cf5 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -40,7 +40,7 @@
   <licenses>
     <license>
       <name>New BSD license</name>
-      <url>http://www.opensource.org/licenses/bsd-license.php</url>
+      <url>https://opensource.org/licenses/BSD-3-Clause</url>
       <distribution>repo</distribution>
     </license>
   </licenses>

javanano/pom.xml

diff --git a/javanano/pom.xml b/javanano/pom.xml
index 6cb8c17..8d08f91 100644
--- a/javanano/pom.xml
+++ b/javanano/pom.xml
@@ -22,7 +22,7 @@
   <licenses>
     <license>
       <name>New BSD license</name>
-      <url>http://www.opensource.org/licenses/bsd-license.php</url>
+      <url>https://opensource.org/licenses/BSD-3-Clause</url>
       <distribution>repo</distribution>
     </license>
   </licenses>

php/ext/google/protobuf/package.xml

diff --git a/php/ext/google/protobuf/package.xml b/php/ext/google/protobuf/package.xml
index 3067bdb..167ed0f 100644
--- a/php/ext/google/protobuf/package.xml
+++ b/php/ext/google/protobuf/package.xml
@@ -20,7 +20,7 @@
   <release>alpha</release>
   <api>alpha</api>
  </stability>
- <license uri="http://www.opensource.org/licenses/bsd-license.php">New BSD License</license>
+ <license uri="https://opensource.org/licenses/BSD-3-Clause">New BSD License</license>
  <notes>
 Second alpha release.
  </notes>
@@ -66,7 +66,7 @@
    </stability>
    <date>2016-09-23</date>
    <time>16:06:07</time>
-   <license uri="http://www.opensource.org/licenses/bsd-license.php">New BSD License</license>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">New BSD License</license>
    <notes>
 First alpha release
    </notes>
@@ -82,7 +82,7 @@
    </stability>
    <date>2017-01-13</date>
    <time>16:06:07</time>
-   <license uri="http://www.opensource.org/licenses/bsd-license.php">New BSD License</license>
+   <license uri="https://opensource.org/licenses/BSD-3-Clause">New BSD License</license>
    <notes>
 Second alpha release.
    </notes>

protoc-artifacts/pom.xml

diff --git a/protoc-artifacts/pom.xml b/protoc-artifacts/pom.xml
index 19c6862..159087c 100644
--- a/protoc-artifacts/pom.xml
+++ b/protoc-artifacts/pom.xml
@@ -22,7 +22,7 @@
   <licenses>
     <license>
       <name>New BSD license</name>
-      <url>http://www.opensource.org/licenses/bsd-license.php</url>
+      <url>https://opensource.org/licenses/BSD-3-Clause</url>
       <distribution>repo</distribution>
     </license>
   </licenses>

ruby/pom.xml

diff --git a/ruby/pom.xml b/ruby/pom.xml
index 7b89613..7f475fd 100644
--- a/ruby/pom.xml
+++ b/ruby/pom.xml
@@ -22,7 +22,7 @@
     <licenses>
       <license>
         <name>New BSD license</name>
-        <url>http://www.opensource.org/licenses/bsd-license.php</url>
+        <url>https://opensource.org/licenses/BSD-3-Clause</url>
         <distribution>repo</distribution>
       </license>
     </licenses>