HADOOP-11738. Fix a link of Protocol Buffers 2.5 for download in BUILDING.txt. (ozawa)

(cherry picked from commit 323945b33a5bccc42e90ed619ea155503cc124b0)

BUILDING.txt

@@ -29,7 +29,7 @@ Installing required packages for clean install of Ubuntu 14.04 LTS Desktop:
 * Native libraries
   $ sudo apt-get -y install build-essential autoconf automake libtool cmake zlib1g-dev pkg-config libssl-dev
 * ProtocolBuffer 2.5.0
-  $ wget https://protobuf.googlecode.com/svn/rc/protobuf-2.5.0.tar.gz
+  $ wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.gz
   $ tar -zxvf protobuf-2.5.0.tar.gz
   $ cd protobuf-2.5.0.tar.gz
   $ ./configure
@@ -312,4 +312,4 @@ http://www.zlib.net/
 ----------------------------------------------------------------------------------
 Building distributions:
 
- * Build distribution with native code    : mvn package [-Pdist][-Pdocs][-Psrc][-Dtar]
+ * Build distribution with native code    : mvn package [-Pdist][-Pdocs][-Psrc][-Dtar]

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -692,6 +692,9 @@ Release 2.7.0 - UNRELEASED
     HADOOP-11014. Potential resource leak in JavaKeyStoreProvider due to
     unclosed stream. (ozawa)
 
+    HADOOP-11738. Fix a link of Protocol Buffers 2.5 for download in BUILDING.txt.
+    (ozawa)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES