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The WebKit library link line is exceeding 128KB on sim-eng builds.
The path to sim-eng object files is slightly longer than device builds
because the object files live under the "host" directory.

This change truncates the "product" directory name to "pr", reducing the
command line by a few KB.  This only affects sim-eng builds.

The real fix will need be to webkit (see internal bug 1917987), which
will eventually start failing on device builds if it continues to grow.