ninja: Stop lower-casing outputs on case-insensitive file systems.
ninja: Stop lower-casing outputs on case-insensitive file systems.

This was added to fix a problem with file renames that rename a file only
in captialization (https://chromiumcodereview.appspot.com/10907140).  Now
that we use depsmode (which reads deps from a flat text file instead of
doing a lookup for a depsfile on the file system, and which always does
so case-sensitively), this is no longer necessary.  The test we added
when we added this hack still passes.

R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/23542007

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1712 78cadc50-ecff-11dd-a971-7dbc132099af

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