libs3: remove make install target

diff --git a/src/libs3 b/src/libs3
index 844a57d24e3361ad6849e6ada5467da153a6ff21..9dc3a9c683385abfe4ad92b7c6ff30719acc3c13 160000 (submodule)
--- a/src/libs3
+++ b/src/libs3
@@ -1 +1 @@
-Subproject commit 844a57d24e3361ad6849e6ada5467da153a6ff21
+Subproject commit 9dc3a9c683385abfe4ad92b7c6ff30719acc3c13