Fix missing -llog when compiling for android

[s1341]

When cross-compiling for android, the android logging code is activated, but liblog.so is not linked in.

This patch fixes that.

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[s1341]

@googlebot I signed it!

[s1341]

What are the checks which failed? Clicking details gives me an 'oops' page.

[acozzette]

I think the test failures are probably caused by an unrelated issue that we've since fixed, let me rerun them and see if they pass now.

[s1341]

Awesome. This seems ready to merge!

[s1341]

Thanks!