[droid] - allow to build android for x86 platforms
[droid] - adapt readme to reflect support of gcc 4.8 toolchains aswell and get rid of the x86 libc flaw we had in older ndk versions (crystax for example)
droid-x86 corrections
Merge pull request #3256 from perpe/droid-x86

[Droid x86] Additions for Android x86 architecture