Get ANDROID_DATA dir from enviroment

Change-Id: Ie3675bd27bbc779fc2140f95b930eadd14838753

Conflicts:
	tests/dlext_test.cpp
Remove strntoimax and strntoumax from the future.

Where do these turds come from?

Change-Id: Id9ad2cc85c6128aa63b5d56ff2aa455bde39a5eb

Conflicts:
	libc/Android.mk
	libc/bionic/ndk_cruft.cpp
Tests for environment variables utility functions

This is the first patch from the new set of tests for Bionic standard functions.

Change-Id: Ie568788a24832394e597ad33f44a5c71cb33b51f
Signed-off-by: Grigoriy Kraynov <grigoriy.kraynov@intel.com>