ninja: reduce quoting of -D flags
ninja: reduce quoting of -D flags

Don't quote flags when it is obvious they don't need quoting.
This covers common flags like -DNDEBUG or -DFOO=bar.

Review URL: https://chromiumcodereview.appspot.com/9212030

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1172 78cadc50-ecff-11dd-a971-7dbc132099af

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