Generate 8.04-compatible Linux toolchain binaries whenever possible.

This patch forces our toolchain build script to look for our
i686-linux-glibc2.7-4.4.3 prebuilt toolchain, and use it, if found,
in order to generate Linux binaries that run on Ubuntu 8.04 and
higher.

+ document the 'asm' to '__asm__' change in development/ndk

Change-Id: I1f119439784fd8b5708e80f75f7c53b09ad8e1fa
2 files changed