Fix Android library link order.
Fix Android library link order.

-lm in link_settings places libm.so very early in the link command
line, which, for some rather complicated reasons, breaks stack
unwinding on Android. Rules in common.gypi already add -lm at the
right place to all Android targets.

BUG=532481
R=brettw@chromium.org,scottmg@chromium.org
TBR=sergeyu@chromium.org

Review URL: https://codereview.chromium.org/1351143002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#349506}

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