Explicitly enable the use of init/fini array under PNaCl

Newlib relies on configure time check to determine and enable
init/fini array support. However, this check uses readelf which
does not work for PNaCl; pnacl-readelf gets around this issue
by explicitly hardcoding this case. This change explicitly
enables the use of init/fini array under PNaCl which does not
rely on pnacl-readelf support and works even with the native
Clang PNaCl driver.

BUG=https://bugs.chromium.org/p/nativeclient/issues/detail?id=4347
R=dschuff@chromium.org

Review URL: https://codereview.chromium.org/1533383004 .
2 files changed