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Fuchsia has a platform requirement that libraries be placed in in the
/lib directory in order to be located by the loader. We used to have a
shlib_subdir variable to satisfy such a requirement.  Bring this variable
back and set it to "/lib" on Fuchsia.

This allows us to reduce special handling of libraries during the
packaging phase. Ideally all package artifacts would be placed correctly
by the build system so that the packager doesn't have to rearrange.

Don't use abspath() in the script, either. Using absolute paths in the
build can be harmful (leaks data, causes cache misses) and is rarely
necessary.

BUG=925040
TBR=mef@chromium.org

Change-Id: Idb2d8d4a0fa493904000244332ed242790698b8b

Reviewed-on: https://chromium-review.googlesource.com/c/1434221Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626877}