abi/bootstrap: ensure libebl backends are in LD_LIBRARY_PATH

bootstrap incorrectly missed to add the path to the libebl backends
(e.g. libebl_aarch64.so) to the printed LD_LIBRARY_PATH.
Fix that.

Bug: 135957120
Change-Id: I5ee2127bee5885101432f41533c4b7cd233c916e
Signed-off-by: Matthias Maennich <maennich@google.com>
diff --git a/abi/bootstrap b/abi/bootstrap
index 38af7f4..3e85a09 100755
--- a/abi/bootstrap
+++ b/abi/bootstrap
@@ -90,6 +90,6 @@
 echo "Note: Export following environment before running the executables:"
 echo
 echo "export PATH=\"${OUT_DIR}/bin:\${PATH}\""
-echo "export LD_LIBRARY_PATH=\"${OUT_DIR}/lib:\${LD_LIBRARY_PATH}\""
+echo "export LD_LIBRARY_PATH=\"${OUT_DIR}/lib:${OUT_DIR}/lib/elfutils:\${LD_LIBRARY_PATH}\""
 echo
 echo