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Unlike the other toolchains, bionic supports both static and dynamic.  This CL adds an environment variable which will allow SDK targets to be built with dynamic linking.  It also enables additional bionic targets such as nacl_io demo and test.

Since the current dynamic loader only supports searching DT_NEEDED namespaces for symbols, bionic forces us to declare dependencies explicitly which causes build order issues.

BUG=none
R=binji@chromium.org

Review URL: https://codereview.chromium.org/240493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266900 0039d316-1c4b-4281-b951-d872f2087c98