Revert "Don't define |r_debug| and |link_map| on Android releases 21 and later"
Revert "Don't define |r_debug| and |link_map| on Android releases 21 and later"

This reverts commit 0fc10739232ac803f7304d01522db6051c7454ff.

Reason: breaks 64bit Android architectures.

BUG=629088
R=primiano@chromium.org

Review URL: https://codereview.chromium.org/2163923002 .

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