make: Generate object files in target-named directories.
make: Generate object files in target-named directories.

This allows multiple targets to share the same source files, without object
files colliding or failing to rebuild for targets with different flags.

TEST=test/same-name/gyptest-all.py
Review URL: http://codereview.chromium.org/345001

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@737 78cadc50-ecff-11dd-a971-7dbc132099af

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