[Hadoop Wiki] Update of "HowToRelease" by NigelDaley

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The following page has been changed by NigelDaley:
http://wiki.apache.org/hadoop/HowToRelease

The comment on the change is:
Make 64 bit Linux build mandatory for release

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  = Building =
  
- 	1. Build the release & run unit tests.  Note that releases are normally built on 32-bit Linux, so that they include the native code for that platform.  Also, folks who build releases should install eclipse, so that the eclipse plugin can be included in releases, pre-compiled. {{{
+ 	1. Build the release & run unit tests.  Note that releases are normally built on 64-bit Linux, so that they include the native code for that platform.  Also, folks who build releases should install eclipse, so that the eclipse plugin can be included in releases, pre-compiled. {{{
- ant -Dversion=X.Y.Z -Dcompile.native=true -Dcompile.c++=true -Dlibhdfs=1 -Declipse.home=/usr/lib/eclipse clean package-libhdfs tar test test-libhdfs
- }}}
-           '''Note:''' If a 64-bit Linux platform is available as well, then both 32-bit and 64-bit libraries may be built.  Instead of the above, perform the following: {{{
  export JAVA_HOME=/path/to/32bit/jdk
  export CFLAGS=-m32
  export CXXFLAGS=-m32