Fixed bad information about 64-bit build environment

* Removed section I had added on 32-bit build environments, since those
  are no longer supported
* Added g++-multilib to the list of required packages
* Removed note about packages needed for froyo, since there is no
  distinction now (all other packages were dependencies of g++-multilib)

Change-Id: I88f252db843009c28e60e9adbf2afaf68a80358b
diff --git a/src/source/initializing.md b/src/source/initializing.md
index 6626482..6f1bd80 100644
--- a/src/source/initializing.md
+++ b/src/source/initializing.md
@@ -64,21 +64,11 @@
 
 ## Installing required packages ##
 
-To set up your development environment, install the following required packages.
-
-64-bit systems:
+To set up your development environment, install the following required packages:
 
     $ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev
       lib32ncurses5-dev ia32-libs x11proto-core-dev libx11-dev lib32readline5-dev lib32z-dev libgl1-mesa-dev
-
-32-bit systems:
-
-    $ sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl zlib1g-dev libc6-dev
-      libncurses5-dev x11proto-core-dev libx11-dev libreadline5-dev libz-dev libgl1-mesa-dev
-
-For building Froyo or an older release on a 64-bit system, several other packages are necessary to establish a 32-bit build environment:
-
-    $ sudo apt-get install gcc-multilib g++-multilib libc6-i386 libc6-dev-i386
+      g++-multilib
 
 ## Configuring USB Access ##