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Remove unnecessary '-r' option from 'ln' command.
For this particular case, we do not have to specify '-r' option. Even if we remove '-r' option here, exactly the same symlink will be created in practice. Not relying on '-r' option is convenient since '-r' option does not work with older versions of 'ln' command. In particular, that option does not work on Ubuntu 12.04, which prevents us from enabling Android build on Travis-CI. This is just a code clean up in build rules. No behavior change in artifacts should occur. BUG=none TEST=compile REF_BUG=none REF_CL=105034319
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